Alt, Shift & Ctrl Foot Pedals

This one occured to me when I broke a finger of my left hand playing bowling ball tag. Of course I usually type with both hands. But even with one hand incapacitated, I still have to work... so with my right hand I do a kind of wacky finger dance over the keyboard as though I'm performing a complex Rachmaninoff piano concerto on the QWERTY. I can still type fairly well with one hand. But - it's terribly awkward doing Shift and Alt and Ctrl combinations and maintaining the flow of typing.

Why do those keys have to be on the keyboard, anyways? They would work great as foot pedals. As a pianist, I know that after a while you learn to use pedals intuitively and you don't even think about what your feet are doing. Capitalizing a letter? you just tap on the pedal as you type in an uninterrupted flow.

Keyboard manufacturers should make keyboards with ports in the back, to which you can connect optional pedal controllers, the way they do with electronic piano keyboards.