diff --git a/src/dehacked.c b/src/dehacked.c
index e7ff6e400..6093d6fd6 100644
--- a/src/dehacked.c
+++ b/src/dehacked.c
@@ -1293,10 +1293,7 @@ static void readgametype(MYFILE *f, char *gtname)
 				UINT32 wordgt = 0;
 				for (j = 0; GAMETYPERULE_LIST[j]; j++)
 					if (fastcmp(word, GAMETYPERULE_LIST[j])) {
-						if (!j) // GTR_CAMPAIGN
-							wordgt |= 1;
-						else
-							wordgt |= (1<<j);
+						wordgt |= (1<<j);
 						if (i || word2[0] == 'T' || word2[0] == 'Y')
 							newgtrules |= wordgt;
 						break;
diff --git a/src/lua_hudlib.c b/src/lua_hudlib.c
index d08b69ffc..dbab801df 100644
--- a/src/lua_hudlib.c
+++ b/src/lua_hudlib.c
@@ -268,10 +268,14 @@ static int patch_get(lua_State *L)
 #endif
 	enum patch field = luaL_checkoption(L, 2, NULL, patch_opt);
 
-	// patches are CURRENTLY always valid, expected to be cached with PU_STATIC
-	// this may change in the future, so patch.valid still exists
-	if (!patch)
+	// patches are invalidated when switching renderers
+	if (!patch) {
+		if (field == patch_valid) {
+			lua_pushboolean(L, 0);
+			return 1;
+		}
 		return LUA_ErrInvalid(L, "patch_t");
+	}
 
 	switch (field)
 	{
diff --git a/src/p_polyobj.c b/src/p_polyobj.c
index cd0a44bb4..a206d0171 100644
--- a/src/p_polyobj.c
+++ b/src/p_polyobj.c
@@ -1001,15 +1001,35 @@ static void Polyobj_pushThing(polyobj_t *po, line_t *line, mobj_t *mo)
 //
 static void Polyobj_slideThing(mobj_t *mo, fixed_t dx, fixed_t dy)
 {
-	if (mo->player) { // Do something similar to conveyor movement. -Red
-		mo->player->cmomx += dx;
-		mo->player->cmomy += dy;
+	if (mo->player) { // Finally this doesn't suck eggs -fickle
+		fixed_t cdx, cdy;
 
-		dx = FixedMul(dx, CARRYFACTOR);
-		dy = FixedMul(dy, CARRYFACTOR);
+		cdx = FixedMul(dx, FRACUNIT-CARRYFACTOR);
+		cdy = FixedMul(dy, FRACUNIT-CARRYFACTOR);
 
-		mo->player->cmomx -= dx;
-		mo->player->cmomy -= dy;
+		if (mo->player->onconveyor == 1)
+		{
+			mo->momx += cdx;
+			mo->momy += cdy;
+
+			// Multiple slides in the same tic, somehow
+			mo->player->cmomx += cdx;
+			mo->player->cmomy += cdy;
+		}
+		else
+		{
+			if (mo->player->onconveyor == 3)
+			{
+				mo->momx += cdx - mo->player->cmomx;
+				mo->momy += cdy - mo->player->cmomy;
+			}
+
+			mo->player->cmomx = cdx;
+			mo->player->cmomy = cdy;
+		}
+
+		dx = FixedMul(dx, FRACUNIT - mo->friction);
+		dy = FixedMul(dy, FRACUNIT - mo->friction);
 
 		if (mo->player->pflags & PF_SPINNING && (mo->player->rmomx || mo->player->rmomy) && !(mo->player->pflags & PF_STARTDASH)) {
 #define SPINMULT 5184 // Consider this a substitute for properly calculating FRACUNIT-friction. I'm tired. -Red
@@ -1282,7 +1302,8 @@ static void Polyobj_rotateThings(polyobj_t *po, vertex_t origin, angle_t delta,
 {
 	static INT32 pomovecount = 10000;
 	INT32 x, y;
-	angle_t deltafine = delta >> ANGLETOFINESHIFT;
+	angle_t deltafine = (((po->angle + delta) >> ANGLETOFINESHIFT) - (po->angle >> ANGLETOFINESHIFT)) & FINEMASK;
+	// This fineshift trickery replaces the old delta>>ANGLETOFINESHIFT; doing it this way avoids loss of precision causing objects to slide off -fickle
 
 	pomovecount++;
 
@@ -1334,19 +1355,10 @@ static void Polyobj_rotateThings(polyobj_t *po, vertex_t origin, angle_t delta,
 					oldxoff = mo->x-origin.x;
 					oldyoff = mo->y-origin.y;
 
-					if (mo->player) // Hack to fix players sliding off of spinning polys -Red
-					{
-						fixed_t temp;
+					newxoff = FixedMul(oldxoff, c)-FixedMul(oldyoff, s) - oldxoff;
+					newyoff = FixedMul(oldyoff, c)+FixedMul(oldxoff, s) - oldyoff;
 
-						temp = FixedMul(oldxoff, c)-FixedMul(oldyoff, s);
-						oldyoff = FixedMul(oldyoff, c)+FixedMul(oldxoff, s);
-						oldxoff = temp;
-					}
-
-					newxoff = FixedMul(oldxoff, c)-FixedMul(oldyoff, s);
-					newyoff = FixedMul(oldyoff, c)+FixedMul(oldxoff, s);
-
-					Polyobj_slideThing(mo, newxoff-oldxoff, newyoff-oldyoff);
+					Polyobj_slideThing(mo, newxoff, newyoff);
 
 					if (turnthings == 2 || (turnthings == 1 && !mo->player)) {
 						mo->angle += delta;
diff --git a/src/p_user.c b/src/p_user.c
index 176b07d0a..a63022986 100644
--- a/src/p_user.c
+++ b/src/p_user.c
@@ -12174,7 +12174,9 @@ void P_PlayerThink(player_t *player)
 
 #ifdef POLYOBJECTS
 	if (player->onconveyor == 1)
-			player->cmomy = player->cmomx = 0;
+		player->onconveyor = 3;
+	else if (player->onconveyor == 3)
+		player->cmomy = player->cmomx = 0;
 #endif
 
 	P_DoSuperStuff(player);
diff --git a/src/r_things.c b/src/r_things.c
index 7f0f43281..ca285644f 100644
--- a/src/r_things.c
+++ b/src/r_things.c
@@ -3463,6 +3463,7 @@ static boolean R_ProcessPatchableFields(skin_t *skin, char *stoken, char *value)
 	GETFLAG(DASHMODE)
 	GETFLAG(FASTEDGE)
 	GETFLAG(MULTIABILITY)
+	GETFLAG(NONIGHTSROTATION)
 #undef GETFLAG
 
 	else // let's check if it's a sound, otherwise error out