Set it to [on] in advanced settings menu (glpro3.99) or if that fails..
Try to set mouse4 to a keystroke in your mouse-driver.. then just bind that key in quake.. should work fine.
Also mouse3 needs to be set to "middle button" in mouse-driver for it to work correctly in quake (usually that is)..
For a kill-peg command you are on your own I'm afraid
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