Okay, this one's quick and dirty addition and is something we actually had years ago:
the ability to have two people man a tank. One guy guns, one guy drives. This was a LOT
of fun years back and I'd like to see it re-implemented.
Another thing we had years back which was really pretty neat was an "F3 view" in
ground vehicles. Bombers get it with the rationale/justification being that it is
replicating the fact that there were multiple positions in a bomber. Well, tanks
had multiple crew positions as well.
Flame away boys.

Regards, Odd