Sorry if these have already been made, but I figured I'd throw my two cents in.
The ability to raid supplies from a dead soldier. (ammo, grenades, etc...)
Other kinds of strikes besides Air Strikes. Maybe like, dropping ammo or health onto a part of the map for your team.
It would be kind of funny to be able to punch people (if you have no weapon and don't want to use your spade)
Having the enemy intel do something when you capture it? Maybe something along the lines of seeing the enemy teamchat for a few moments, or showing were the enemies are again for a brief period?
Something to steal besides the enemy intel? Maybe camping in their tent gives you 1 extra grenade or something?
Fish in the water? Just for grins and giggles?
It'd be interesting to see bullet holes where people have shot indestructible map features such as the ground, or things of that nature.
I'll probably conjure up more suggestions later, but these are the ones off the top of my head.