Having a GLUT window die on me because I accidentally scroll the mouse wheel down finally drove me mad enough to go track the problem down. I'm not sure if this is the correct way to do it, but weighing in at one line sexp it sure feels good. I picked :wheel-down but I guess any keyword can be put in it's place.
the change: in glut/callbacks.lisp add (:wheel-down -1) to the mouse-button-state cenum.
Charlie Mac