Fursphere

Trackball & Spinner Support for BigBox Navigation.  Supports X & Y axis (configurable) to simulate up/down/left/right menu movement.   Option menu support to configure speeds and behavior.  
Its not perfect, but it does work pretty well.  It disables itself when a game is launched.
If there is interest in the source, I can put it up on github or something.   Just ask.   

Update:  As of Beta 14.1.x - this functionality is built into BigBox, and this plugin is no longer needed.