This works for me on Ubuntu 11.04:
<http://askubuntu.com/questions/59128/how-to-disable-mouse-wheel-scroll-in-ubuntu-11-04-or-10-10>
To restore it (assuming for example the ID was 9):
xinput set-button-map 9 1 2 3 4 5
WGT is presumably happy with the bad user experience of something they could easily fix (this should be an option in Settings).
This may work for Macs as well, as xinput exists on Mac.