- added MF7_ALWAYSTELEFRAG flag that causes an actor to be telefragged by everything that teleports into the same place.

src/actor.h

@@ -338,6 +338,7 @@ enum
 
 	MF7_NEVERTARGET		= 0x00000001,	// can not be targetted at all, even if monster friendliness is considered.
 	MF7_NOTELESTOMP		= 0x00000002,	// cannot telefrag under any circumstances (even when set by MAPINFO)
+	MF7_ALWAYSTELEFRAG	= 0x00000004,	// will unconditionally be telefragged when in the way. Overrides all other settings.
 
 // --- mobj.renderflags ---
 

src/p_map.cpp

@@ -382,7 +382,8 @@ bool P_TeleportMove (AActor *thing, fixed_t x, fixed_t y, fixed_t z, bool telefr
 
 		// monsters don't stomp things except on boss level
 		// [RH] Some Heretic/Hexen monsters can telestomp
-		if (StompAlwaysFrags && !(th->flags6 & MF6_NOTELEFRAG))
+		// ... and some items can never be telefragged while others will be telefragged by everything that teleports upon them.
+		if ((StompAlwaysFrags && !(th->flags6 & MF6_NOTELEFRAG)) || (th->flags7 & MF7_ALWAYSTELEFRAG))
 		{
 			P_DamageMobj (th, thing, thing, TELEFRAG_DAMAGE, NAME_Telefrag, DMG_THRUSTLESS);
 			continue;

src/thingdef/thingdef_data.cpp

@@ -239,6 +239,7 @@ static FFlagDef ActorFlags[]=
 
 	DEFINE_FLAG(MF7, NEVERTARGET, AActor, flags7),
 	DEFINE_FLAG(MF7, NOTELESTOMP, AActor, flags7),
+	DEFINE_FLAG(MF7, ALWAYSTELEFRAG, AActor, flags7),
 
 	// Effect flags
 	DEFINE_FLAG(FX, VISIBILITYPULSE, AActor, effects),