Option "EmulateWheel" "boolean"
Enable/disable "wheel" emulation. Wheel emulation means emulating button press/release events when the mouse is moved while a specific real button is pressed. Wheel button events (typically buttons 4 and 5) are usually used for scrolling. Wheel emulation is useful for getting wheel-like behaviour with trackballs. It can also be useful for mice with 4 or more buttons but no wheel. See the description of the EmulateWheelButton, EmulateWheelInertia, XAxisMapping, and YAxisMapping options below. Default: off.

Wow! Super! Endlich eine sinnvolle Anwendung für den vierten Button an meinem Trackball (der ist nämlich eigentlich genau dafür gedacht)! Ich hab's noch gar nicht getestet, bin aber trotzdem schon begeistert. :-)

[x] ulf