Cannot disable sticky keys

Once in awhile I will leave my finger on the shift key just a bit to
long while thinking about what I'm going to type next. The result is
sticky keys activates and I have to reboot to get rid of it. I've
disabled all it's features in the control panel but this annoying
feature cannot be gotten rid of as far as I can find. Is there a
registry hack that I can use to disable it permanently?

Tony