Scroll to the bottom of http://snarfed.org/space/invert+mouse+in+Beyond+Good+&+Evil to download a script to invert the y-axis. It uses AutoHotKey which remaps keyboard & mouse buttons.
http://autohotkey.com/
In http://www.evoluent.com/support.htm it says there's a left-handed model. Would that be any easier to use if you're holding it upside-down?
http://autohotkey.com/
In http://www.evoluent.com/support.htm it says there's a left-handed model. Would that be any easier to use if you're holding it upside-down?