Abstract: A mouse assembly includes a modular auxiliary unit that is operable in complement with a floor or pedal assembly. The modular auxiliary unit includes structure for conveniently securing the unit as well as a mouse functionality section, such as a track ball or the like. The floor or pedal assembly includes one or more clicking pedals and a scrolling wheel for foot-operated mouse manipulations. The assembly facilitates mouse-type operations while reducing risks of injury associated with repetitive motions such as carpal tunnel syndrome and tendinitis.