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...but if you change the location of the squash stretch controller, it animates the center point of the squash/stretch, which can cause the squash/stretch to work incorrectly in some animation. Have you looked at Matt Ornstein's ball - https://www.mattornstein.com/downloads.html? It can be squashed stretched from either end - not as full featured as your rig, but perhaps more controllable. His is based on a rig by Lichiman which is no longer on the web, though I found it by scouring a web archive - pm me if you'd like a copy.
Another feature I'd like to add to this simple rig would be a way to bend the "head" - ie to make it look like it has a little bit of head for personality and to lead the body around. I think that would make it more useful as a practice rig.
Thanx.
