diff --git a/src/g_doom/a_doomweaps.cpp b/src/g_doom/a_doomweaps.cpp
index 0063e72c..07b7c0f5 100644
--- a/src/g_doom/a_doomweaps.cpp
+++ b/src/g_doom/a_doomweaps.cpp
@@ -467,7 +467,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePlasma)
 //
 // [RH] A_FireRailgun
 //
-static void FireRailgun(AActor *self, int RailOffset)
+static void FireRailgun(AActor *self, int offset_xy)
 {
 	int damage;
 	player_t *player;
@@ -492,7 +492,7 @@ static void FireRailgun(AActor *self, int RailOffset)
 
 	damage = deathmatch ? 100 : 150;
 
-	P_RailAttack (self, damage, RailOffset);
+	P_RailAttack (self, damage, offset_xy);
 }
 
 
diff --git a/src/p_local.h b/src/p_local.h
index 0c16373b..fe149d43 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -469,7 +469,7 @@ void	P_TraceBleed (int damage, AActor *target);		// random direction version
 bool	P_HitFloor (AActor *thing);
 bool	P_HitWater (AActor *thing, sector_t *sec, fixed_t splashx = FIXED_MIN, fixed_t splashy = FIXED_MIN, fixed_t splashz=FIXED_MIN, bool checkabove = false, bool alert = true);
 void	P_CheckSplash(AActor *self, fixed_t distance);
-void	P_RailAttack (AActor *source, int damage, int offset, int color1 = 0, int color2 = 0, float maxdiff = 0, int flags = 0, const PClass *puff = NULL, angle_t angleoffset = 0, angle_t pitchoffset = 0, fixed_t distance = 8192*FRACUNIT, int duration = 0, float sparsity = 1.0, float drift = 1.0, const PClass *spawnclass = NULL);	// [RH] Shoot a railgun
+void	P_RailAttack (AActor *source, int damage, int offset_xy, fixed_t offset_z = 0, int color1 = 0, int color2 = 0, float maxdiff = 0, int flags = 0, const PClass *puff = NULL, angle_t angleoffset = 0, angle_t pitchoffset = 0, fixed_t distance = 8192*FRACUNIT, int duration = 0, float sparsity = 1.0, float drift = 1.0, const PClass *spawnclass = NULL);	// [RH] Shoot a railgun
 
 enum	// P_RailAttack / A_RailAttack / A_CustomRailgun / P_DrawRailTrail flags
 {	
diff --git a/src/p_map.cpp b/src/p_map.cpp
index 4777d7e9..c31e6636 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -3942,7 +3942,7 @@ static bool ProcessNoPierceRailHit (FTraceResults &res)
 //
 //
 //==========================================================================
-void P_RailAttack (AActor *source, int damage, int offset, int color1, int color2, float maxdiff, int railflags, const PClass *puffclass, angle_t angleoffset, angle_t pitchoffset, fixed_t distance, int duration, float sparsity, float drift, const PClass *spawnclass)
+void P_RailAttack (AActor *source, int damage, int offset_xy, fixed_t offset_z, int color1, int color2, float maxdiff, int railflags, const PClass *puffclass, angle_t angleoffset, angle_t pitchoffset, fixed_t distance, int duration, float sparsity, float drift, const PClass *spawnclass)
 {
 	fixed_t vx, vy, vz;
 	angle_t angle, pitch;
@@ -3963,7 +3963,7 @@ void P_RailAttack (AActor *source, int damage, int offset, int color1, int color
 	x1 = source->x;
 	y1 = source->y;
 
-	shootz = source->z - source->floorclip + (source->height >> 1);
+	shootz = source->z - source->floorclip + (source->height >> 1) + offset_z;
 
 	if (!(railflags & RAF_CENTERZ))
 	{
@@ -3978,8 +3978,8 @@ void P_RailAttack (AActor *source, int damage, int offset, int color1, int color
 	}
 
 	angle = ((source->angle + angleoffset) - ANG90) >> ANGLETOFINESHIFT;
-	x1 += offset*finecosine[angle];
-	y1 += offset*finesine[angle];
+	x1 += offset_xy * finecosine[angle];
+	y1 += offset_xy * finesine[angle];
 
 	RailHits.Clear ();
 	start.X = FIXED2FLOAT(x1);
@@ -4478,7 +4478,7 @@ void P_RadiusAttack (AActor *bombspot, AActor *bombsource, int bombdamage, int b
 	AActor *thing;
 
 	if (flags & RADF_SOURCEISSPOT)
-	{ // The source is actually the same as the spot, even if that wasn't what we receized.
+	{ // The source is actually the same as the spot, even if that wasn't what we received.
 		bombsource = bombspot;
 	}
 
@@ -4567,11 +4567,12 @@ void P_RadiusAttack (AActor *bombspot, AActor *bombsource, int bombdamage, int b
 			}
 			points *= thing->GetClass()->Meta.GetMetaFixed(AMETA_RDFactor, FRACUNIT)/(double)FRACUNIT;
 
-			if (points > 0.f && P_CheckSight (thing, bombspot, SF_IGNOREVISIBILITY|SF_IGNOREWATERBOUNDARY))
+			// points and bombdamage should be the same sign
+			if ((points * bombdamage) > 0 && P_CheckSight (thing, bombspot, SF_IGNOREVISIBILITY|SF_IGNOREWATERBOUNDARY))
 			{ // OK to damage; target is in direct path
 				double velz;
 				double thrust;
-				int damage = (int)points;
+				int damage = abs((int)points);
 				int newdam = damage;
 
 				if (!(flags & RADF_NODAMAGE))
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index f07ab0ff..d36c2746 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -5619,11 +5619,11 @@ AActor *P_SpawnPlayerMissile (AActor *source, fixed_t x, fixed_t y, fixed_t z,
 							  bool nofreeaim)
 {
 	static const int angdiff[3] = { -1<<26, 1<<26, 0 };
-	int i;
 	angle_t an = angle;
 	angle_t pitch;
 	AActor *linetarget;
-	int vrange = nofreeaim? ANGLE_1*35 : 0;
+	AActor *defaultobject = GetDefaultByType(type);
+	int vrange = nofreeaim ? ANGLE_1*35 : 0;
 
 	if (source && source->player && source->player->ReadyWeapon && (source->player->ReadyWeapon->WeaponFlags & WIF_NOAUTOAIM))
 	{
@@ -5634,11 +5634,16 @@ AActor *P_SpawnPlayerMissile (AActor *source, fixed_t x, fixed_t y, fixed_t z,
 	}
 	else // see which target is to be aimed at
 	{
-		i = 2;
+		// [XA] If MaxTargetRange is defined in the spawned projectile, use this as the
+		//      maximum range for the P_AimLineAttack call later; this allows MaxTargetRange
+		//      to function as a "maximum tracer-acquisition range" for seeker missiles.
+		fixed_t linetargetrange = defaultobject->maxtargetrange > 0 ? defaultobject->maxtargetrange*64 : 16*64*FRACUNIT;
+
+		int i = 2;
 		do
 		{
 			an = angle + angdiff[i];
-			pitch = P_AimLineAttack (source, an, 16*64*FRACUNIT, &linetarget, vrange);
+			pitch = P_AimLineAttack (source, an, linetargetrange, &linetarget, vrange);
 	
 			if (source->player != NULL &&
 				!nofreeaim &&
@@ -5660,8 +5665,6 @@ AActor *P_SpawnPlayerMissile (AActor *source, fixed_t x, fixed_t y, fixed_t z,
 	}
 	if (pLineTarget) *pLineTarget = linetarget;
 
-	i = GetDefaultByType (type)->flags3;
-
 	if (z != ONFLOORZ && z != ONCEILINGZ)
 	{
 		// Doom spawns missiles 4 units lower than hitscan attacks for players.
diff --git a/src/p_teleport.cpp b/src/p_teleport.cpp
index 79dd105f..50470d9e 100644
--- a/src/p_teleport.cpp
+++ b/src/p_teleport.cpp
@@ -184,14 +184,16 @@ bool P_Teleport (AActor *thing, fixed_t x, fixed_t y, fixed_t z, angle_t angle,
 	if (sourceFog)
 	{
 		fixed_t fogDelta = thing->flags & MF_MISSILE ? 0 : TELEFOGHEIGHT;
-		Spawn<ATeleportFog> (oldx, oldy, oldz + fogDelta, ALLOW_REPLACE);
+		AActor *fog = Spawn<ATeleportFog> (oldx, oldy, oldz + fogDelta, ALLOW_REPLACE);
+		fog->target = thing;
 	}
 	if (useFog)
 	{
 		fixed_t fogDelta = thing->flags & MF_MISSILE ? 0 : TELEFOGHEIGHT;
 		an = angle >> ANGLETOFINESHIFT;
-		Spawn<ATeleportFog> (x + 20*finecosine[an],
+		AActor *fog = Spawn<ATeleportFog> (x + 20*finecosine[an],
 			y + 20*finesine[an], thing->z + fogDelta, ALLOW_REPLACE);
+		fog->target = thing;
 		if (thing->player)
 		{
 			// [RH] Zoom player's field of vision
diff --git a/src/svnrevision.h b/src/svnrevision.h
index 34b2534e..4d4e70a3 100644
--- a/src/svnrevision.h
+++ b/src/svnrevision.h
@@ -3,5 +3,5 @@
 // This file was automatically generated by the
 // updaterevision tool. Do not edit by hand.
 
-#define ZD_SVN_REVISION_STRING "4186"
-#define ZD_SVN_REVISION_NUMBER 4186
+#define ZD_SVN_REVISION_STRING "4191"
+#define ZD_SVN_REVISION_NUMBER 4191
diff --git a/src/thingdef/thingdef_codeptr.cpp b/src/thingdef/thingdef_codeptr.cpp
index c1ff7853..ccb7f596 100644
--- a/src/thingdef/thingdef_codeptr.cpp
+++ b/src/thingdef/thingdef_codeptr.cpp
@@ -838,8 +838,8 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_RadiusThrust)
 
 	bool sourcenothrust = false;
 
-	if (force <= 0) force = 128;
-	if (distance <= 0) distance = force;
+	if (force == 0) force = 128;
+	if (distance <= 0) distance = abs(force);
 
 	// Temporarily negate MF2_NODMGTHRUST on the shooter, since it renders this function useless.
 	if (!(flags & RTF_NOTMISSILE) && self->target != NULL && self->target->flags2 & MF2_NODMGTHRUST)
@@ -847,7 +847,6 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_RadiusThrust)
 		sourcenothrust = true;
 		self->target->flags2 &= ~MF2_NODMGTHRUST;
 	}
-	int sourceflags2 = self->target != NULL ? self->target->flags2 : 0;
 
 	P_RadiusAttack (self, self->target, force, distance, self->DamageType, flags | RADF_NODAMAGE, fullthrustdistance);
 	P_CheckSplash(self, distance << FRACBITS);
@@ -1430,7 +1429,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_CustomPunch)
 //==========================================================================
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_RailAttack)
 {
-	ACTION_PARAM_START(15);
+	ACTION_PARAM_START(16);
 	ACTION_PARAM_INT(Damage, 0);
 	ACTION_PARAM_INT(Spawnofs_XY, 1);
 	ACTION_PARAM_BOOL(UseAmmo, 2);
@@ -1446,6 +1445,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_RailAttack)
 	ACTION_PARAM_FLOAT(Sparsity, 12);
 	ACTION_PARAM_FLOAT(DriftSpeed, 13);
 	ACTION_PARAM_CLASS(SpawnClass, 14);
+	ACTION_PARAM_FIXED(Spawnofs_Z, 15);
 	
 	if(Range==0) Range=8192*FRACUNIT;
 	if(Sparsity==0) Sparsity=1.0;
@@ -1474,7 +1474,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_RailAttack)
 		slope = pr_crailgun.Random2() * (Spread_Z / 255);
 	}
 
-	P_RailAttack (self, Damage, Spawnofs_XY, Color1, Color2, MaxDiff, Flags, PuffType, angle, slope, Range, Duration, Sparsity, DriftSpeed, SpawnClass);
+	P_RailAttack (self, Damage, Spawnofs_XY, Spawnofs_Z, Color1, Color2, MaxDiff, Flags, PuffType, angle, slope, Range, Duration, Sparsity, DriftSpeed, SpawnClass);
 }
 
 //==========================================================================
@@ -1492,7 +1492,7 @@ enum
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_CustomRailgun)
 {
-	ACTION_PARAM_START(15);
+	ACTION_PARAM_START(16);
 	ACTION_PARAM_INT(Damage, 0);
 	ACTION_PARAM_INT(Spawnofs_XY, 1);
 	ACTION_PARAM_COLOR(Color1, 2);
@@ -1508,6 +1508,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_CustomRailgun)
 	ACTION_PARAM_FLOAT(Sparsity, 12);
 	ACTION_PARAM_FLOAT(DriftSpeed, 13);
 	ACTION_PARAM_CLASS(SpawnClass, 14);
+	ACTION_PARAM_FIXED(Spawnofs_Z, 15);
 
 	if(Range==0) Range=8192*FRACUNIT;
 	if(Sparsity==0) Sparsity=1.0;
@@ -1591,7 +1592,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_CustomRailgun)
 		slopeoffset = pr_crailgun.Random2() * (Spread_Z / 255);
 	}
 
-	P_RailAttack (self, Damage, Spawnofs_XY, Color1, Color2, MaxDiff, Flags, PuffType, angleoffset, slopeoffset, Range, Duration, Sparsity, DriftSpeed, SpawnClass);
+	P_RailAttack (self, Damage, Spawnofs_XY, Spawnofs_Z, Color1, Color2, MaxDiff, Flags, PuffType, angleoffset, slopeoffset, Range, Duration, Sparsity, DriftSpeed, SpawnClass);
 
 	self->x = saved_x;
 	self->y = saved_y;
@@ -1717,102 +1718,127 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_TakeFromTarget)
 // Common code for A_SpawnItem and A_SpawnItemEx
 //
 //===========================================================================
+
 enum SIX_Flags
 {
-	SIXF_TRANSFERTRANSLATION=1,
-	SIXF_ABSOLUTEPOSITION=2,
-	SIXF_ABSOLUTEANGLE=4,
-	SIXF_ABSOLUTEVELOCITY=8,
-	SIXF_SETMASTER=16,
-	SIXF_NOCHECKPOSITION=32,
-	SIXF_TELEFRAG=64,
-	// 128 is used by Skulltag!
-	SIXF_TRANSFERAMBUSHFLAG=256,
-	SIXF_TRANSFERPITCH=512,
-	SIXF_TRANSFERPOINTERS=1024,
-	SIXF_USEBLOODCOLOR=2048,
+	SIXF_TRANSFERTRANSLATION	= 1 << 0,
+	SIXF_ABSOLUTEPOSITION		= 1 << 1,
+	SIXF_ABSOLUTEANGLE			= 1 << 2,
+	SIXF_ABSOLUTEVELOCITY		= 1 << 3,
+	SIXF_SETMASTER				= 1 << 4,
+	SIXF_NOCHECKPOSITION		= 1 << 5,
+	SIXF_TELEFRAG				= 1 << 6,
+	SIXF_CLIENTSIDE				= 1 << 7,	// only used by Skulldronum
+	SIXF_TRANSFERAMBUSHFLAG		= 1 << 8,
+	SIXF_TRANSFERPITCH			= 1 << 9,
+	SIXF_TRANSFERPOINTERS		= 1 << 10,
+	SIXF_USEBLOODCOLOR			= 1 << 11,
+	SIXF_CLEARCALLERTID			= 1 << 12,
+	SIXF_MULTIPLYSPEED			= 1 << 13,
+	SIXF_TRANSFERSCALE			= 1 << 14,
 };
 
-
 static bool InitSpawnedItem(AActor *self, AActor *mo, int flags)
 {
-	if (mo)
+	if (mo == NULL)
 	{
-		AActor * originator = self;
+		return false;
+	}
+	AActor *originator = self;
 
-		if (!(mo->flags2 & MF2_DONTTRANSLATE))
+	if (!(mo->flags2 & MF2_DONTTRANSLATE))
+	{
+		if (flags & SIXF_TRANSFERTRANSLATION)
 		{
-			if (flags & SIXF_TRANSFERTRANSLATION)
-			{
-				mo->Translation = self->Translation;
-			}
-			else if (flags & SIXF_USEBLOODCOLOR)
-			{
-				// [XA] Use the spawning actor's BloodColor to translate the newly-spawned object.
-				PalEntry bloodcolor = self->GetBloodColor();
-				mo->Translation = TRANSLATION(TRANSLATION_Blood, bloodcolor.a);
-			}
+			mo->Translation = self->Translation;
 		}
-		if (flags & SIXF_TRANSFERPOINTERS)
+		else if (flags & SIXF_USEBLOODCOLOR)
 		{
-			mo->target = self->target;
-			mo->master = self->master; // This will be overridden later if SIXF_SETMASTER is set
-			mo->tracer = self->tracer;
+			// [XA] Use the spawning actor's BloodColor to translate the newly-spawned object.
+			PalEntry bloodcolor = self->GetBloodColor();
+			mo->Translation = TRANSLATION(TRANSLATION_Blood, bloodcolor.a);
 		}
+	}
+	if (flags & SIXF_TRANSFERPOINTERS)
+	{
+		mo->target = self->target;
+		mo->master = self->master; // This will be overridden later if SIXF_SETMASTER is set
+		mo->tracer = self->tracer;
+	}
 
-		mo->angle=self->angle;
-		if (flags & SIXF_TRANSFERPITCH) mo->pitch = self->pitch;
-		while (originator && originator->isMissile()) originator = originator->target;
+	mo->angle = self->angle;
+	if (flags & SIXF_TRANSFERPITCH)
+	{
+		mo->pitch = self->pitch;
+	}
+	while (originator && originator->isMissile())
+	{
+		originator = originator->target;
+	}
 
-		if (flags & SIXF_TELEFRAG) 
+	if (flags & SIXF_TELEFRAG) 
+	{
+		P_TeleportMove(mo, mo->x, mo->y, mo->z, true);
+		// This is needed to ensure consistent behavior.
+		// Otherwise it will only spawn if nothing gets telefragged
+		flags |= SIXF_NOCHECKPOSITION;	
+	}
+	if (mo->flags3 & MF3_ISMONSTER)
+	{
+		if (!(flags & SIXF_NOCHECKPOSITION) && !P_TestMobjLocation(mo))
 		{
-			P_TeleportMove(mo, mo->x, mo->y, mo->z, true);
-			// This is needed to ensure consistent behavior.
-			// Otherwise it will only spawn if nothing gets telefragged
-			flags |= SIXF_NOCHECKPOSITION;	
+			// The monster is blocked so don't spawn it at all!
+			mo->ClearCounters();
+			mo->Destroy();
+			return false;
 		}
-		if (mo->flags3&MF3_ISMONSTER)
+		else if (originator)
 		{
-			if (!(flags&SIXF_NOCHECKPOSITION) && !P_TestMobjLocation(mo))
+			if (originator->flags3 & MF3_ISMONSTER)
 			{
-				// The monster is blocked so don't spawn it at all!
-				mo->ClearCounters();
-				mo->Destroy();
-				return false;
+				// If this is a monster transfer all friendliness information
+				mo->CopyFriendliness(originator, true);
+				if (flags & SIXF_SETMASTER) mo->master = originator;	// don't let it attack you (optional)!
 			}
-			else if (originator)
+			else if (originator->player)
 			{
-				if (originator->flags3&MF3_ISMONSTER)
+				// A player always spawns a monster friendly to him
+				mo->flags |= MF_FRIENDLY;
+				mo->SetFriendPlayer(originator->player);
+
+				AActor * attacker=originator->player->attacker;
+				if (attacker)
 				{
-					// If this is a monster transfer all friendliness information
-					mo->CopyFriendliness(originator, true);
-					if (flags&SIXF_SETMASTER) mo->master = originator;	// don't let it attack you (optional)!
-				}
-				else if (originator->player)
-				{
-					// A player always spawns a monster friendly to him
-					mo->flags |= MF_FRIENDLY;
-					mo->SetFriendPlayer(originator->player);
-
-					AActor * attacker=originator->player->attacker;
-					if (attacker)
+					if (!(attacker->flags&MF_FRIENDLY) || 
+						(deathmatch && attacker->FriendPlayer!=0 && attacker->FriendPlayer!=mo->FriendPlayer))
 					{
-						if (!(attacker->flags&MF_FRIENDLY) || 
-							(deathmatch && attacker->FriendPlayer!=0 && attacker->FriendPlayer!=mo->FriendPlayer))
-						{
-							// Target the monster which last attacked the player
-							mo->LastHeard = mo->target = attacker;
-						}
+						// Target the monster which last attacked the player
+						mo->LastHeard = mo->target = attacker;
 					}
 				}
 			}
 		}
-		else if (!(flags & SIXF_TRANSFERPOINTERS))
-		{
-			// If this is a missile or something else set the target to the originator
-			mo->target=originator? originator : self;
-		}
 	}
+	else if (!(flags & SIXF_TRANSFERPOINTERS))
+	{
+		// If this is a missile or something else set the target to the originator
+		mo->target = originator ? originator : self;
+	}
+	if (flags & SIXF_TRANSFERSCALE)
+	{
+		mo->scaleX = self->scaleX;
+		mo->scaleY = self->scaleY;
+	}
+	if (flags & SIXF_TRANSFERAMBUSHFLAG)
+	{
+		mo->flags = (mo->flags & ~MF_AMBUSH) | (self->flags & MF_AMBUSH);
+	}
+	if (flags & SIXF_CLEARCALLERTID)
+	{
+		self->RemoveFromHash();
+		self->tid = 0;
+	}
+
 	return true;
 }
 
@@ -1862,7 +1888,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SpawnItem)
 					self->y + FixedMul(distance, finesine[self->angle>>ANGLETOFINESHIFT]), 
 					self->z - self->floorclip + self->GetBobOffset() + zheight, ALLOW_REPLACE);
 
-	int flags = (transfer_translation? SIXF_TRANSFERTRANSLATION:0) + (useammo? SIXF_SETMASTER:0);
+	int flags = (transfer_translation ? SIXF_TRANSFERTRANSLATION : 0) + (useammo ? SIXF_SETMASTER : 0);
 	bool res = InitSpawnedItem(self, mo, flags);
 	ACTION_SET_RESULT(res);	// for an inventory item's use state
 }
@@ -1876,7 +1902,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SpawnItem)
 //===========================================================================
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SpawnItemEx)
 {
-	ACTION_PARAM_START(10);
+	ACTION_PARAM_START(11);
 	ACTION_PARAM_CLASS(missile, 0);
 	ACTION_PARAM_FIXED(xofs, 1);
 	ACTION_PARAM_FIXED(yofs, 2);
@@ -1887,6 +1913,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SpawnItemEx)
 	ACTION_PARAM_ANGLE(Angle, 7);
 	ACTION_PARAM_INT(flags, 8);
 	ACTION_PARAM_INT(chance, 9);
+	ACTION_PARAM_INT(tid, 10);
 
 	if (!missile) 
 	{
@@ -1929,17 +1956,30 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SpawnItemEx)
 		xvel = newxvel;
 	}
 
-	AActor * mo = Spawn(missile, x, y, self->z - self->floorclip + self->GetBobOffset() + zofs, ALLOW_REPLACE);
+	AActor *mo = Spawn(missile, x, y, self->z - self->floorclip + self->GetBobOffset() + zofs, ALLOW_REPLACE);
 	bool res = InitSpawnedItem(self, mo, flags);
 	ACTION_SET_RESULT(res);	// for an inventory item's use state
-	if (mo)
+	if (res)
 	{
-		mo->velx = xvel;
-		mo->vely = yvel;
-		mo->velz = zvel;
+		if (tid != 0)
+		{
+			assert(mo->tid == 0);
+			mo->tid = tid;
+			mo->AddToHash();
+		}
+		if (flags & SIXF_MULTIPLYSPEED)
+		{
+			mo->velx = FixedMul(xvel, mo->Speed);
+			mo->vely = FixedMul(yvel, mo->Speed);
+			mo->velz = FixedMul(zvel, mo->Speed);
+		}
+		else
+		{
+			mo->velx = xvel;
+			mo->vely = yvel;
+			mo->velz = zvel;
+		}
 		mo->angle = Angle;
-		if (flags & SIXF_TRANSFERAMBUSHFLAG)
-			mo->flags = (mo->flags&~MF_AMBUSH) | (self->flags & MF_AMBUSH);
 	}
 }
 
diff --git a/wadsrc/static/actors/actor.txt b/wadsrc/static/actors/actor.txt
index b4024878..ab0898fa 100644
--- a/wadsrc/static/actors/actor.txt
+++ b/wadsrc/static/actors/actor.txt
@@ -198,7 +198,7 @@ ACTOR Actor native //: Thinker
 	action native A_Jump(int chance = 256, state label, ...);
 	action native A_CustomMissile(class<Actor> missiletype, float spawnheight = 32, int spawnofs_xy = 0, float angle = 0, int flags = 0, float pitch = 0);
 	action native A_CustomBulletAttack(float spread_xy, float spread_z, int	numbullets, int damageperbullet, class<Actor> pufftype = "BulletPuff", float range = 0, int flags = 0);
-	action native A_CustomRailgun(int damage, int spawnofs_xy = 0, color color1 = "", color color2 = "", int flags = 0, bool aim = false, float maxdiff = 0, class<Actor> pufftype = "BulletPuff", float spread_xy = 0, float spread_z = 0, float range = 0, int duration = 0, float sparsity = 1.0, float driftspeed = 1.0, class<Actor> spawnclass = "none");
+	action native A_CustomRailgun(int damage, int spawnofs_xy = 0, color color1 = "", color color2 = "", int flags = 0, bool aim = false, float maxdiff = 0, class<Actor> pufftype = "BulletPuff", float spread_xy = 0, float spread_z = 0, float range = 0, int duration = 0, float sparsity = 1.0, float driftspeed = 1.0, class<Actor> spawnclass = "none", float spawnofs_z = 0);
 	action native A_JumpIfHealthLower(int health, state label);
 	action native A_JumpIfCloser(float distance, state label);
 	action native A_JumpIfTracerCloser(float distance, state label);
@@ -210,7 +210,7 @@ ACTOR Actor native //: Thinker
 	action native A_GiveInventory(class<Inventory> itemtype, int amount = 0, int giveto = AAPTR_DEFAULT);
 	action native A_TakeInventory(class<Inventory> itemtype, int amount = 0, int flags = 0, int giveto = AAPTR_DEFAULT);
 	action native A_SpawnItem(class<Actor> itemtype = "Unknown", float distance = 0, float zheight = 0, bool useammo = true, bool transfer_translation = false);
-	action native A_SpawnItemEx(class<Actor> itemtype, float xofs = 0, float yofs = 0, float zofs = 0, float xvel = 0, float yvel = 0, float zvel = 0, float angle = 0, int flags = 0, int failchance = 0);
+	action native A_SpawnItemEx(class<Actor> itemtype, float xofs = 0, float yofs = 0, float zofs = 0, float xvel = 0, float yvel = 0, float zvel = 0, float angle = 0, int flags = 0, int failchance = 0, int tid=0);
 	action native A_Print(string whattoprint, float time = 0, string fontname = "");
 	action native A_PrintBold(string whattoprint, float time = 0, string fontname = "");
 	action native A_Log(string whattoprint);
diff --git a/wadsrc/static/actors/constants.txt b/wadsrc/static/actors/constants.txt
index 07dbeda7..db4e9abb 100644
--- a/wadsrc/static/actors/constants.txt
+++ b/wadsrc/static/actors/constants.txt
@@ -41,19 +41,22 @@ const int FBF_NOFLASH = 16;
 const int FBF_NORANDOMPUFFZ = 32;
 
 // Flags for A_SpawnItemEx
-const int SXF_TRANSFERTRANSLATION=1;
-const int SXF_ABSOLUTEPOSITION=2;
-const int SXF_ABSOLUTEANGLE=4;
-const int SXF_ABSOLUTEMOMENTUM=8;
-const int SXF_ABSOLUTEVELOCITY=8;
-const int SXF_SETMASTER=16;
+const int SXF_TRANSFERTRANSLATION = 1;
+const int SXF_ABSOLUTEPOSITION = 2;
+const int SXF_ABSOLUTEANGLE = 4;
+const int SXF_ABSOLUTEMOMENTUM = 8;
+const int SXF_ABSOLUTEVELOCITY = 8;
+const int SXF_SETMASTER = 16;
 const int SXF_NOCHECKPOSITION = 32;
-const int SXF_TELEFRAG=64;
-const int SXF_CLIENTSIDE=128;	// only used by Skulltag
-const int SXF_TRANSFERAMBUSHFLAG=256;
-const int SXF_TRANSFERPITCH=512;
-const int SXF_TRANSFERPOINTERS=1024;
-const int SXF_USEBLOODCOLOR=2048;
+const int SXF_TELEFRAG = 64;
+const int SXF_CLIENTSIDE = 128;	// only used by Skulltag
+const int SXF_TRANSFERAMBUSHFLAG = 256;
+const int SXF_TRANSFERPITCH = 512;
+const int SXF_TRANSFERPOINTERS = 1024;
+const int SXF_USEBLOODCOLOR = 2048;
+const int SXF_CLEARCALLERTID = 4096;
+const int SXF_MULTIPLYSPEED = 8192;
+const int SXF_TRANSFERSCALE = 16384;
 
 // Flags for A_Chase
 const int CHF_FASTCHASE = 1;
diff --git a/wadsrc/static/actors/shared/inventory.txt b/wadsrc/static/actors/shared/inventory.txt
index 0632195c..7b2c3d5e 100644
--- a/wadsrc/static/actors/shared/inventory.txt
+++ b/wadsrc/static/actors/shared/inventory.txt
@@ -11,7 +11,7 @@ ACTOR Inventory native
 	action native A_CustomPunch(int damage, bool norandom = false, int flags = CPF_USEAMMO, class<Actor> pufftype = "BulletPuff", float range = 0, float lifesteal = 0);
 	action native A_FireBullets(float spread_xy, float spread_z, int numbullets, int damageperbullet, class<Actor> pufftype = "BulletPuff", int flags = 1, float range = 0);
 	action native A_FireCustomMissile(class<Actor> missiletype, float angle = 0, bool useammo = true, int spawnofs_xy = 0, float spawnheight = 0, bool aimatangle = false, float pitch = 0);
-	action native A_RailAttack(int damage, int spawnofs_xy = 0, int useammo = true, color color1 = "", color color2 = "", int flags = 0, float maxdiff = 0, class<Actor> pufftype = "BulletPuff", float spread_xy = 0, float spread_z = 0, float range = 0, int duration = 0, float sparsity = 1.0, float driftspeed = 1.0, class<Actor> spawnclass = "none");
+	action native A_RailAttack(int damage, int spawnofs_xy = 0, int useammo = true, color color1 = "", color color2 = "", int flags = 0, float maxdiff = 0, class<Actor> pufftype = "BulletPuff", float spread_xy = 0, float spread_z = 0, float range = 0, int duration = 0, float sparsity = 1.0, float driftspeed = 1.0, class<Actor> spawnclass = "none", float spawnofs_z = 0);
 	action native A_Light(int extralight);
 	action native A_Light0();
 	action native A_Light1();