The notion of a conventional mouse is extended to provide an extended number of simultaneously adjustable user interface parameters. In one family of realizations, one or more trackballs, touchpads, or other types of user interface sensors may be added to a traditional mouse to provide additional user...http://www.google.de/patents/US7557797?utm_source=gb-gplus-sharePatent US7557797 - Mouse-based user interface device providing multiple parameters and modalities
