1. A computer system having a graphical user interface for displaying actions of an input device on a display, said interface comprising: a radial menu comprising: an origin disposed at a center of said radial menu, and at least a first wedge defining an area extending outwardly from said origin, said first wedge associated with a variable that is capable of being set to a value between a predetermined minimum value and a predetermined maximum value; and a cursor for indicating a current position of the input device on the display, said cursor being movable within said first wedge to select a current value of the variable based upon the angular position of said cursor with respect to said origin.