It could be configurable by robot. This would be as easy as a text file in the .zip called "controls.txt" which details the keymappings and drive style. For instance, line 1 would always be the drvie style and it could either be "tank" or "car".
The key drives are
very easy to program using CS (I've gotten that far in the docs...

). Yeah!
My vote of "other" is: make it configurable. The game can have a global drive key config for different drive styles, and the actual robot zip tells the game what type to use.