I've only been back a week or so and I just noticed that my scroll button (mouse button 3) is assigned to walk forward (clicking the button not scrolling). Not sure if this was an update in a patch or whether something particular to me somehow but it gets really annoying as I tend to scroll my camera in and out a hell of a lot and many times accidentally click the button.
So is there any way to disable this as I can;t see the option in the options menu or that the button ahs been assigned to walk forward.