i would suggest that if you die close enough to a player set MASH you would either get the option to spawn there or spawn there automagically. I think this would be good for the following reasons:
1: Being a medic is now actually worthwhile.
2: Playing as infantry through the whole map is now a viable option without the need for half the gametime to be transports.
3: Sticking together and working as a team is now even more rewarding.
I would also suggest that (if possible) make the "build MASH" action has a cooldown so that you cannot simply mash the build mash (pun intended). Also, adding a "build ammo box" and "build weapon box" would be nifty to add to the assault classes/sniper/whatever that has no real teamplay worth as of now, well apart from the obvious "can kill stuff" that all other classes has (theese would also have a cooldown if possible, tho longer than that of the mash, or make it so that if closer than 1km you cannot place another)
Thoughts?
edit: well maybe not a weapon box as that would be kinda hard to do so that you can only get weapons according to rank, i dunno, but perhaps just make it contain a few standard weapons (could make it contain stuff depending on the rank of the player placing it tho, maybe one or two ranks below whatever that players rank is...) /edit