Speaking of teleportation, I thought I'd quickly mention that in the Overworld you can now click on the map and you'll get teleported nearby that challenge orb. That'll save some driving back and forth.
I really think that this should only be activated on demo/mapmaker mode, because the point of the overworld IS that you have to drive through it.
Besides, the overworld is pretty small right now and I can quickly go from one point to another. Having infinite nitro is a good idea, teleporting is not, IMO.