Steffen, you rock!
In fact, the only way you could rock more, is if you made a clone of Stunt Car Racer that had a better 3D engine, and supported internet play, but kept the basic gameplay the same. After all, OS4 could really do with some games that weren't ported from the PC and arent first person shooters...
Not that i'm trying to put ideas in your head

But anyway, back on topic, I'm quite looking forward to trying this out when I finally get a PPC based computer :-D