[Mushrooshi]

I'd add cheaper plastic gears, maybe with a reinforced metal framework? Imagine... rickshaw wheels, but it is metal, not wooden, and has plastic filling the voids. Not to make the metal gears absolutely gone though. I'd rather have plastic drive gears and metal arm gears at the same time. Hell, making a decent drivetrain can cost the team in half their budget.

Piston sort of stuff would be interesting to see, and would add great potential. Perhaps hydrolic (sorry, can't spell it) pistons, for heavy stuff like arms, and maybe pneumatics, to toss stuff. It would be interesting.

Sets of chains and sprokets would be awesome aswell.