No Guarantees, but take a look at the following.
X-Mouse Button Control
http://www.highrez.co.uk/downloads/XMouseButtonControl.htm

Rock solid little program if it will work for you

I have tried unsuccessfully to use Kensington Mouseworks to program my mouse buttons to do

Alt-Q and Windows-F2. I have Alt-q defined to do the "tasks list" and Windows-F2 to do the Window Catalog.

Alt-Q works, shows display but then disappears immediately so I cannot select anything.

Windows-F2, doesn't seem to trigger the window catalog as expected.

Is there another recommended way to use mouse buttons to do dexpot actions?

I have four buttons on the Kensington mouse I have. I'm trying program the top left and top right buttons.

Thanks.