well i for one wouldnt like to see vehicles in NS, it simply wouldnt fit in. we're on a spaceship/station, with somewhat crammed up space - this is what creates the atmosphere - without that it's a little meh, and well it would draw the lamers even more...
what i would really like to see is a tad more complex game, more upgrades going into different aspects, perhaps a few extra -original- weapons too, and perhaps some more lifeforms(which has to be original too..).
But simple is the keyword here, simple. - and outdoor maps is not part of the NS gameplay
...hmm the physics in the engine itself would make it able to have some pretty interesting maps, not that i can think of any, but it would XD.