diff --git a/src/actor.h b/src/actor.h
index 13511b617..42689310b 100644
--- a/src/actor.h
+++ b/src/actor.h
@@ -417,7 +417,8 @@ enum ActorRenderFlag
 	RF_FLATSPRITE		= 0x2000,	// Flat sprite
 	RF_VOXELSPRITE		= 0x3000,	// Voxel object
 	RF_INVISIBLE		= 0x8000,	// Don't bother drawing this actor
-	RF_MAYBEINVISIBLE	= 0x10000,
+	RF_FORCEYBILLBOARD	= 0x10000,	// [BB] OpenGL only: draw with y axis billboard, i.e. anchored to the floor (overrides gl_billboard_mode setting)
+	RF_FORCEXYBILLBOARD	= 0x20000,	// [BB] OpenGL only: draw with xy axis billboard, i.e. unanchored (overrides gl_billboard_mode setting)
 	RF_ROLLSPRITE		= 0x40000,	//[marrub]roll the sprite billboard
 	RF_DONTFLIP			= 0x80000,	// Don't flip it when viewed from behind.
 	RF_ROLLCENTER		= 0x00100000, // Rotate from the center of sprite instead of offsets
@@ -425,9 +426,7 @@ enum ActorRenderFlag
 	RF_ABSMASKANGLE		= 0x00400000, // [MC] The mask rotation does not offset by the actor's angle.
 	RF_ABSMASKPITCH		= 0x00800000, // [MC] The mask rotation does not offset by the actor's pitch.
 	RF_INTERPOLATEANGLES		= 0x01000000, // [MC] Allow interpolation of the actor's angle, pitch and roll.
-
-	RF_FORCEYBILLBOARD		= 0x10000,	// [BB] OpenGL only: draw with y axis billboard, i.e. anchored to the floor (overrides gl_billboard_mode setting)
-	RF_FORCEXYBILLBOARD		= 0x20000,	// [BB] OpenGL only: draw with xy axis billboard, i.e. unanchored (overrides gl_billboard_mode setting)
+	RF_MAYBEINVISIBLE	= 0x02000000,
 };
 
 // This translucency value produces the closest match to Heretic's TINTTAB.
diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index 197a0616d..00b1d7be8 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -114,13 +114,6 @@ FRandom pr_acs ("ACS");
 #define HUDMSG_VISIBILITY_MASK		(0x00070000)
 // See HUDMSG visibility enumerations in sbar.h
 
-// Flags for ReplaceTextures
-#define NOT_BOTTOM			1
-#define NOT_MIDDLE			2
-#define NOT_TOP				4
-#define NOT_FLOOR			8
-#define NOT_CEILING			16
-
 // LineAttack flags
 #define FHF_NORANDOMPUFFZ	1
 #define FHF_NOIMPACTDECAL	2
@@ -3322,47 +3315,6 @@ void DLevelScript::SetLineTexture (int lineid, int side, int position, int name)
 	}
 }
 
-void DLevelScript::ReplaceTextures (int fromnamei, int tonamei, int flags)
-{
-	const char *fromname = FBehavior::StaticLookupString (fromnamei);
-	const char *toname = FBehavior::StaticLookupString (tonamei);
-	FTextureID picnum1, picnum2;
-
-	if (fromname == NULL)
-		return;
-
-	if ((flags ^ (NOT_BOTTOM | NOT_MIDDLE | NOT_TOP)) != 0)
-	{
-		picnum1 = TexMan.GetTexture (fromname, FTexture::TEX_Wall, FTextureManager::TEXMAN_Overridable);
-		picnum2 = TexMan.GetTexture (toname, FTexture::TEX_Wall, FTextureManager::TEXMAN_Overridable);
-
-		for (auto &side : level.sides)
-		{
-			for(int j=0;j<3;j++)
-			{
-				static BYTE bits[]={NOT_TOP, NOT_MIDDLE, NOT_BOTTOM};
-				if (!(flags & bits[j]) && side.GetTexture(j) == picnum1)
-				{
-					side.SetTexture(j, picnum2);
-				}
-			}
-		}
-	}
-	if ((flags ^ (NOT_FLOOR | NOT_CEILING)) != 0)
-	{
-		picnum1 = TexMan.GetTexture (fromname, FTexture::TEX_Flat, FTextureManager::TEXMAN_Overridable);
-		picnum2 = TexMan.GetTexture (toname, FTexture::TEX_Flat, FTextureManager::TEXMAN_Overridable);
-
-		for (auto &sec : level.sectors)
-		{
-			if (!(flags & NOT_FLOOR) && sec.GetTexture(sector_t::floor) == picnum1) 
-				sec.SetTexture(sector_t::floor, picnum2);
-			if (!(flags & NOT_CEILING) && sec.GetTexture(sector_t::ceiling) == picnum1)	
-				sec.SetTexture(sector_t::ceiling, picnum2);
-		}
-	}
-}
-
 int DLevelScript::DoSpawn (int type, const DVector3 &pos, int tid, DAngle angle, bool force)
 {
 	PClassActor *info = PClass::FindActor(FBehavior::StaticLookupString (type));
@@ -8352,9 +8304,14 @@ scriptwait:
 			break;
 
 		case PCD_REPLACETEXTURES:
-			ReplaceTextures (STACK(3), STACK(2), STACK(1));
+		{
+			const char *fromname = FBehavior::StaticLookupString(STACK(3));
+			const char *toname = FBehavior::StaticLookupString(STACK(2));
+
+			P_ReplaceTextures(fromname, toname, STACK(1));
 			sp -= 3;
 			break;
+		}
 
 		case PCD_SETLINEBLOCKING:
 			{
diff --git a/src/p_acs.h b/src/p_acs.h
index 52665a39b..8265e5b37 100644
--- a/src/p_acs.h
+++ b/src/p_acs.h
@@ -913,7 +913,6 @@ protected:
 	static void ChangeFlat (int tag, int name, bool floorOrCeiling);
 	static int CountPlayers ();
 	static void SetLineTexture (int lineid, int side, int position, int name);
-	static void ReplaceTextures (int fromname, int toname, int flags);
 	static int DoSpawn (int type, const DVector3 &pos, int tid, DAngle angle, bool force);
 	static int DoSpawn(int type, int x, int y, int z, int tid, int angle, bool force);
 	static bool DoCheckActorTexture(int tid, AActor *activator, int string, bool floor);
diff --git a/src/p_local.h b/src/p_local.h
index d50d2be52..89346328e 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -441,4 +441,15 @@ enum EDmgFlags
 //
 bool P_AlignFlat (int linenum, int side, int fc);
 
+enum ETexReplaceFlags
+{
+	NOT_BOTTOM			= 1,
+	NOT_MIDDLE			= 2,
+	NOT_TOP				= 4,
+	NOT_FLOOR			= 8,
+	NOT_CEILING			= 16
+};
+
+void P_ReplaceTextures(const char *fromname, const char *toname, int flags);
+
 #endif	// __P_LOCAL__
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 53491f235..829674ba6 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -144,8 +144,6 @@ IMPLEMENT_POINTERS_START(AActor)
 	IMPLEMENT_POINTER(Poisoner)
 	IMPLEMENT_POINTER(DamageFunc)
 	IMPLEMENT_POINTER(alternative)
-	IMPLEMENT_POINTER(TeleFogSourceType)
-	IMPLEMENT_POINTER(TeleFogDestType)
 IMPLEMENT_POINTERS_END
 
 AActor::~AActor ()
diff --git a/src/p_sectors.cpp b/src/p_sectors.cpp
index e85fd744f..5e0a8f6ac 100644
--- a/src/p_sectors.cpp
+++ b/src/p_sectors.cpp
@@ -2120,6 +2120,63 @@ bool P_AlignFlat (int linenum, int side, int fc)
 	return true;
 }
 
+
+
+//==========================================================================
+//
+// P_ReplaceTextures
+//
+//==========================================================================
+
+void P_ReplaceTextures(const char *fromname, const char *toname, int flags)
+{
+	FTextureID picnum1, picnum2;
+
+	if (fromname == nullptr)
+		return;
+
+	if ((flags ^ (NOT_BOTTOM | NOT_MIDDLE | NOT_TOP)) != 0)
+	{
+		picnum1 = TexMan.GetTexture(fromname, FTexture::TEX_Wall, FTextureManager::TEXMAN_Overridable);
+		picnum2 = TexMan.GetTexture(toname, FTexture::TEX_Wall, FTextureManager::TEXMAN_Overridable);
+
+		for (auto &side : level.sides)
+		{
+			for (int j = 0; j<3; j++)
+			{
+				static uint8_t bits[] = { NOT_TOP, NOT_MIDDLE, NOT_BOTTOM };
+				if (!(flags & bits[j]) && side.GetTexture(j) == picnum1)
+				{
+					side.SetTexture(j, picnum2);
+				}
+			}
+		}
+	}
+	if ((flags ^ (NOT_FLOOR | NOT_CEILING)) != 0)
+	{
+		picnum1 = TexMan.GetTexture(fromname, FTexture::TEX_Flat, FTextureManager::TEXMAN_Overridable);
+		picnum2 = TexMan.GetTexture(toname, FTexture::TEX_Flat, FTextureManager::TEXMAN_Overridable);
+
+		for (auto &sec : level.sectors)
+		{
+			if (!(flags & NOT_FLOOR) && sec.GetTexture(sector_t::floor) == picnum1)
+				sec.SetTexture(sector_t::floor, picnum2);
+			if (!(flags & NOT_CEILING) && sec.GetTexture(sector_t::ceiling) == picnum1)
+				sec.SetTexture(sector_t::ceiling, picnum2);
+		}
+	}
+}
+
+DEFINE_ACTION_FUNCTION(_TexMan, ReplaceTextures)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(from);
+	PARAM_STRING(to);
+	PARAM_INT(flags);
+	P_ReplaceTextures(from, to, flags);
+	return 0;
+}
+
 //==========================================================================
 //
 // P_BuildPolyBSP
diff --git a/src/posix/cocoa/i_input.mm b/src/posix/cocoa/i_input.mm
index 786166a7b..74ef5c1cc 100644
--- a/src/posix/cocoa/i_input.mm
+++ b/src/posix/cocoa/i_input.mm
@@ -680,7 +680,10 @@ void ProcessMouseButtonEvent(NSEvent* theEvent)
 
 void ProcessMouseWheelEvent(NSEvent* theEvent)
 {
-	const CGFloat delta    = [theEvent deltaY];
+	const SWORD modifiers = ModifierFlagsToGUIKeyModifiers(theEvent);
+	const CGFloat delta   = (modifiers & GKM_SHIFT)
+		? [theEvent deltaX]
+		: [theEvent deltaY];
 	const bool isZeroDelta = fabs(delta) < 1.0E-5;
 
 	if (isZeroDelta && GUICapture)
@@ -694,7 +697,7 @@ void ProcessMouseWheelEvent(NSEvent* theEvent)
 	{
 		event.type    = EV_GUI_Event;
 		event.subtype = delta > 0.0f ? EV_GUI_WheelUp : EV_GUI_WheelDown;
-		event.data3   = ModifierFlagsToGUIKeyModifiers(theEvent);
+		event.data3   = modifiers;
 	}
 	else
 	{
diff --git a/wadsrc/static/zscript/base.txt b/wadsrc/static/zscript/base.txt
index 1ff8a5e92..5ba744a8e 100644
--- a/wadsrc/static/zscript/base.txt
+++ b/wadsrc/static/zscript/base.txt
@@ -28,8 +28,20 @@ struct TexMan
 		ShortNameOnly = 16,
 		DontCreate = 32
 	};
+	
+	enum ETexReplaceFlags
+	{
+		NOT_BOTTOM			= 1,
+		NOT_MIDDLE			= 2,
+		NOT_TOP				= 4,
+		NOT_FLOOR			= 8,
+		NOT_CEILING			= 16,
+		NOT_WALL			= 7,
+		NOT_FLAT			= 24
+	};
 
 	native static TextureID CheckForTexture(String name, int usetype, int flags = TryAny);
+	native static void ReplaceTextures(String from, String to, int flags);
 }
 
 enum DrawTextureTags