Why not? The whole surface is multi-touch, so it would seem like one could program the logic to detect 3 fingers on the mouse and the middle one pressing down.

Why not? The whole surface is multi-touch, so it would seem like one could program the logic to detect 3 fingers on the mouse and the middle one pressing down. I think the cool part about this mouse is the bluetooth. Those of us with aging laptops can still enjoy multi touch gestures without buying a whole new laptop.