Have you guys seen this? It is a hybrid of magnetic steering cars... and RC cars. This winds up being a slotless lane changing slot-car track, or an RC track.
http://www.youtube.com/watch?v=NFNdT...eature=related
Magnet in car, and steel wire in track... magnet makes the cars wheels turn where ever the wire is.
You could make a track and mod kit for the Z or dnano, and let it be the rookie driver kit lol... It would require a change to the servo though so it was limp when not turning left or right... and the car may need to turn tighter.