Well, inspired on the non-weapon mode, we could make a mode resembling F-Zero: No weapons at all, only turbo pads and falling off the track would lend to an automatic retirement. Oh, and speed wise it's a Gamma-only mode.

I really don't know if this would fit, but imo it would give the players a tough time keeping the ship all time on tracks, since they're way narrower than F-Zero's tracks.