to use the middle mousebutton for scroll-events put this into ~/.xinputrc

 xinput set-prop "TPPS/2 IBM TrackPoint" "Evdev Wheel Emulation" 1
 xinput set-prop "TPPS/2 IBM TrackPoint" "Evdev Wheel Emulation Button" 2
 xinput set-prop "TPPS/2 IBM TrackPoint" "Evdev Wheel Emulation Timeout" 200

make it executable:

 chmod u+x ./.xinputrc

and run it:

 ./.xinputrc
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