I moved Ctrl to my left thumb, on the inside of the keyboard, about ten years ago.
It's still possible to hurt your thumb from overuse, but it's a far stronger finger than the pinky, and no stretching is involved.
It's still possible to hurt your thumb from overuse, but it's a far stronger finger than the pinky, and no stretching is involved.
That makes the key on the left of the spacebar as Ctrl and the key on the right of the spacebar as Alt. This is much better, in my opinion, than using the pinky on the Capslock.