I don't have the forscan software and hardware yet but years and years ago I was down to edit some source code. It is my understanding that forscan lets you dump your current vehicle bcm config to a file. Can you (or anyone) give me a copy of your vehicle file (if it doesn't contain anything personal like your VIN). I would like to poke around in it. I suspect that the mm per rotation value may be something that could be set directly and you might not even need forscan to do that, a simple hex editor might do depending on the file encoding.