Other special features include adjustable width (though no adjustable weighting -- c'mon, guys), a huge "wing" on the right side meant to keep your fingers from dragging, and a software suite that lets you recordmacros, tweak the million on-board lights, and even turn the bulky rodent into a fairly-functional joystick.
While it's been possible for ages to record keyboard and mouse commands as macros, quality assurance teams sometimes can't have any tracking software running -- a real pain when trying to recreate a bug in an online RPG or other input-heavy apps.