I think the 5 minute thing was tried already but didn't work. People were flying around with doubled ammo load in anything with lots of cannons and would strafe things the second then regen'd. It meant that a structure was down for 5 minutes, then up for 10 seconds, then down for another 5.... anyone who tried to spawn was constantly annoyed that they wouldn't be able to launch (no hangers) or the fuel was porked. It also lead to people bombing others on the runway with the jabo bombsight (which doesn't miss).
The TA has so many other "special mods" too in settings that it isn't really like the MA. Double ammo, outside views enabled, no fuel burn rate, jabo-bombsight, etc... all good for training at an early level but more realistic training requires most of those to be set to more MA levels. I don't even think the enemy ack levels are set that high and cause no damage.
-Soda
AH Trainer Corps.