Hey dude, pretty nifty script. Some of those setup functions that you listed would be fun to build right into the script, so all you have to do is click the cylinder and, and if finds the radius based off of the bounding box, or have it create its own point helper at the lowest z axis point on that box. I'd like to give that a crack if you don't mind.
Also do i see a bit of dust coming off of the rig? is that in the next version, the automatic dust emitting wheel rig?