Terrific idea!
- Allow Jetpack and Battery Pack
- Don't make the Bike a buyable at the Armory, instead make it a buildable. I'm thinking 8 BPs or so here. Actually the BPs required would probably be essential in making sure it's not overpowered. When the Bike is destroyed, BPs are of course returned, just like with any other buildable.
- Make it look like a military version of the BMW C1 (
http://www.bmw-c1.de),
Reactor or Armory colored maybe. Maybe even make 2 versions of it. The first like described above, without the ability to go up stairs, and taking damage when going down stairs. The second, "Advanced Combat Bike" maybe, becomes available at S2 and looks more like a bad-ass motocross dirtbike. Think agressive. This one can go up and down stairs without a problem, but in addition also reacts to creative use of the jump and duck keys, so you can do wierd tricks if you're good enough (sliding down rails, jumping up boxes and so on, make it real hard to perfom these tricks tho).
- About shooting while riding: I'd handle this a bit like in real life; riding with your hands on the handles should be real easy, everybody can do it, blaster allowed (can keep one hand at the handle). When using your primary weapon though it should become hard to keep the thing up. Steering done with the strafe keys, need to be real sensitive. If you fall you'll have to mount it again (Enter key does that, but takes 2 seconds or so). This would also be true for the case that one of the heavier aliens or your teammates pushes hard against the bike from the side.
- Good sounds! Especially the Advanced Combat Bike, it needs a load and roary sound! Drawback (intended): bikes can be heard LONG before they even appear on Alien radar.
- Speed: the Combat Bike should be fast, definitely faster than a charging Tyrant. The Advanced Combat Bike should be a tad slower than a charging Tyrant.
>:]

EDIT: Could one of the admins please fix BBCode for me? :-( (Yes, it IS enabled)