i've asked them about that in the past, they wont allow you to select the weapons for mobiles, because they want solid templates for selling on the space station, so if you buy a unit, you know whats in it, i've talked to them before about this, its another one of those thing that they refuse to change, no matter how obvious it is that it isn't working
about the ammo upgrades, i've been doing that, but i'd have to say its kinda pointless, when you upgrading LTA, it takes allot of upgrades. the GM have promised to create a low cost upgrade for things like tanks and artillery, but have still to deliver,
shrug, i guess their are allot of other things to work on, tanks and such only really shoot at each other, and everything else that shoots at them, uses more expensive missiles.