The jaw seems like a pretty complicated joint in its function. Not necessarily as complicated in movement as some of the other joints, but as far as clamping force required, and necessity to have proper alignment to function (pain-free).

I don't think that surgery on the jaw itself should be an option in cases other than severe pain limiting function of the joint. If the teeth are crowded, remove a couple - that definitely seems like the choice with the least potential for complications that could essentially ruin someone's everyday life anyway.