These function will be a fine addition to my collection ACSUtils.

function bool SetActorPositionForced(int tid, int x, int y, int z, bool fog)
{
	bool result = Warp(tid, x, y, z, 0, WARPF_MOVEPTR|WARPF_ABSOLUTEPOSITION|WARPF_NOCHECKPOSITION);
	if (fog)
		SpawnForced("TeleportFog", x, y, z);
	return result;
}