I saw a jig online that looked interesting, it is the Miter Set Segments. Basically it is a plate with holes that allows the miter gauge to be easily set for any shape with 4 to 20 sides. (I am sure everyone else has known about this but I didn’t.) Since we have a ShopBot and I have AutoCAD I drew up a very similar piece and cut the holes in a piece of pine. Then I tested it with a 9 sided polygon. Since it worked out great, I thought I would offer to leave it in the wood shop for anyone else that would like to use it.