My ThinkPad has a trackpoint mouse like that and then 3 mouse buttons. The third button (the middle one) works as either middle click or if you hold it down, it turns the trackpoint stick into a scroll stick. My laptop doesn't have a touchpad (which is awesome, I hate touchpads) so it only has the trackpoint for input. I'm sure there's a way you could do that on your laptop though. In Linux it's a custom setting that's easy to do on all devices, but Windows might require a special driver.