I would like to see the ability for a battle designer to mod vehicle/guns performance/operational status. I have read accounts of specific battles where, for instance, an AFV/gun is present but has mechanical problems (slow speeds only, only HE for ammo, immobile AFV, No ammo for main gun, turret/gun cannot rotate, etc.)
Pardon my ignorance, but I've only played around a tiny bit with the battlemaker in CMBO/CMBB and I don't recall seeing this feature.