[kriro]

I think APM should simply be passed as a parameter. Max it out at whatever is the theoretical maximum for a human (how often can the fastest person click buttons). Then you can challenge a player to a game where you offer something like 10% less than their average APM over the last n games. It would actually be quite interesting to see how much APM actually influences the victory. You can easily test this by having cloned AIs play themselves at different APM values and come up with an added value per added APM measure.