Sweet mother of ..! I love it!
Though I can't really follow the second part. When you add an Position XYZ to the Available slot you end up with 2 posXYZ controllers. In which one should you add the Float Script? In both?
I don't think it'll be possible to use it on rectangles. In this script tyson calculates the inner turning circle of the sides of the box. If you have a box that has on side longer as the rest the turning circle won't match, if you get my point