Hi folks, over here in good old Europe we drive our dnanos on Mini-96 or even regular Mini-Z tracks. We found out, that with a x-speed and some cars on the track you definitly can make use of the space.
Concerning the disc-damper-issue: most of our drivers trust in these parts
http://www.lmn-tuningparts.de. Maybe you can arrange a shipment to the US?
Driving your dnano with a disc damper will absolutely give you a boost in performance, handling and stability.
Racer