Is surgery is out of the question?

In all seriousness I am a size 13 and am tempted to drive barefooted. So I can only imagine a size 15

There isn't much room in the footwell so I don't see much to work with there. If I could get the clutch pedal to move over 1/2" I'd be happier because my foot can't get to the dead pedal without having to point my toe and go under the clutch pedal and do the reverse when trying to use the clutch. What I plan to try is getting a shoe that is less bulky and see if that works. Sometimes the sole on the shoe is quite a bit wider than your actual foot and makes things feel sloppy when you drive a stick. That is what I am going to try first.