How do I configure my mouse?

[R Kimber]

How can I configure my mouse buttons?

I have a logitech LX7 cordless mouse with 4 actual buttons and a wheel.

I need the left thumb button (which seems to be recognised as button 8)
to be able to paste from the clipboard.  This worked with 8.04, but it
doesn't with 8.10.  I can't see any configuration options in
System->Preferences.

Is there a stand alone program that will achieve this?

Or is there a file somewhere to edit?

-- 
Richard Kimber
http://www.psr.keele.ac.uk/