I'll make this as simple as possible. allow people to have manual gear instead of automatic. I've honestly never driven a tank before, and I hope not too (F-15 is more like it for me), but I know buggies, jeeps and others are much better if you have manual gear. providing of course you're a good driver and not just some rich city kid.
so... would you want to see a choice added? after all, a vanguard driver has little else to do anyway. you can add anti newB things like protecting the engine from blowing up
anyone here who drove 4X4 veichles with and without stick shift will probably know what I'm talking about. hard terrain (in planetside it's pretty much the slopes) is much harder with automatic.