In BC2, which vehicle unlocks still work in a not-driver-position?
- Alternative Weapon Package: if you're gunner on gunship, you have tracer darts as alternative fire
- Improved Warheads Package: according to specs increases damage on all vehicle weapons, thus should also work on gunner
- Active Armor Upgrade: vehicle should get upgrade if at least one player in it has the specialization. It's not cumulative (eg. you don't get 2 or more upgrades for 2 or more players with it)