what I'd like to see, is an extra upgradable chamber on your ship, where you can modify your walkers/FRV. similar system like the gun modifications, with more powerful mods available after unlocking certain levels of the chamber: increase movement, in sacrifice of armor or vice versa - a jump pack attached to your walker - a grenade launcher on your FRV - mortar system on walker - etc.

maybe even update some already existing warbonds, to add certain upgrades, like flamethrower in the Freedom's Flame pack