Originally Posted by JackCY
Capacitive "hidden" scroll wheel and MMB switch. Swipe the surface to scroll how far you want, tap to click. Maybe some mice have this already, like those crazy Apple etc. who knows, you don't get steps but who cares when you can program it so that in games 1 swipe no matter how long over a threshold = 1 step. More so games often ignore number of steps anyway and filter the user input heavily unfortunately.
Carbon fiber is electrically conductive, so I don't think capacitive touch would work without a design change. I think the metallic looking surfaces with capacitive touch are plastic with mica in the paint. They could always make the scroll section out of plastic I guess.