I have been using the V470 Logitech bt mouse and it works really great with N900. I would also love to control fennec-7.0.1 too but I just cannot make it work.
Yes, I did add the line:
override chrome://browser/content/cursor.css data:text/plain,<nada/>
to the chrome.manifest, localized.manifest and nonlocalized.manifest files but still, the mouse cursor is invisible....

Anyone out there that has a success story to share?