like this
http://www.newegg.com/Product/Product.a ... 6826153017
plz answer! thx

I hope that answers your question, but if not, the short answer is no.Can you add support for more buttons?
Unfortunately, XMouse is not a driver. It is only capable of responding the messages sent by the mouse driver. As far as I can see, the basic MS driver sends only messages for the first 5 buttons.
The new Logitech drivers for x64 also only send the first 5 buttons so I suspect, even with proper drivers, XMouse will only ever support 5 buttons.
NOTE: The x64 Logitech software does support all the buttons but even with these drivers and software installed, XMouse itself can see no more than 5 buttons.