Would you be able to make a room where the player spawns in the main room, but the BOFFs would spawn in a room behind that with no exits?
One thing you could try is to build a wall near the back of the room you're spawning in, parallel to the back wall, and position your spawn point so that your BOffs spawn on the "wrong" side of the wall. Alternatively, for outdoor maps, use four wall segments to build a four-sided "fence" around where your BOffs will spawn.
Of course, you'd have to do that for all your respawn points too.
Last edited by paxfederatica; 03-15-2013 at 02:41 PM.