what about missing fingers? (Score 1)

I perused the website and found their gesture-based input interesting. I can see how it would boost efficiency not having to take one's hands off the keys to move the mouse. What the page didn't seem to answer is, what of people with missing fingers? Since different finger combos are interpreted differently, I'm guessing the keybd recognizes relative distances or locations. If any fingers are missing or malformed, how much would it throw off the recognition scheme?