Another movement system that is hard for people who aren't used to it but which I got really good at is this:
up/dn: accelerate/brake
left/right: turn left /right
That's how starport GE (a very addictive free MMO game that restarts every 2 weeks, well worth a look for anyone who has nothing to do for the next month ) does it.
I think we'd have to have a full set of customizable controls, like most FPS have. That way everyone can configure it to their preference.
Some people prefer the wasd (the w,a,s,d keys for up,dn,lft, right) system of movement, others the arrow keys.
It would be alot of fun to see if you can make a bot that could beat a human in real time combat.
And a good HUD would be essential.