Running Limewire 2.3.x and up, it's never been the right button on my Kensington Turbo Mouse (4 button silver trackball base with a translucent ball) on my dual G4 grey and white. Have you tried telling the Kensington software that for the specific application "Limewire", you map the right button to command-click? That is what it takes for me. Except I'm lazy and really only want 3 buttons, so I map both right to command-click in Limewire. Please note, it's command-click, not command-right click.

Chrys