[The golfer]

I had a quick reply from Kensington:

Thank you for contacting Kensington Technical Support.

We understand that you are experiencing difficulties with the Expert Mouse Trackball model # 64325. In this regard, we would like to inform you that the scrolling on the trackball is a standard feature and cannot be disabled either with the software or hardware settings. We also regret to inform you that the computer operating systems do not have any primary settings to turn off the scroll feature.

So I guess Glue is the only option.

Thank you Bruce for your input.