Since this should be in the suggestions forum, I made a thread there where we can discuss it. The basics should be fairly easy to code, resupply corridors are more of a hassle. It's been a while since I did any 3D coding, but in theory an invisible sphere with hit detection and a few states attached to the squad leader should do the trick.Seconded, I think the devs should make note of this in case they ever decide to tweak the spawn criteria. might be complicated to code however.
The thread in suggestions may be found here: http://forums.tripwireinteractive.com/showthread.php?p=778813#post778813