I know all to well what it's like to have obtained all the Rock you need and not really need any more or even want any more.
But, I have a request.
The next time your mining and you find that you have all the Rock that you need instead of leaving that Rock half Picked how about next time you're mining finish mining that Rock and if you don't want or need the excess just drop it on the ground. At least that way the Rock will regenerate instead of being half Picked.
Thank You!