I play with Quake lot of times and I usually go forward with MOUSE2 instead of W. I tried to eleminate the " zoom " function in every sub menu and the game also confirmed my new movement ( only MOUSE2 = FORWARD ) but it doesn't work at all. That means I can not move forward but I can zoom :) however there is no zoom setup at all in the control menu.
Please fix this movement issue, because lof ot people use " non standard " controls. As I checked there was no more issue with the movement.