I'd just like to have the ability to click once and be able to mine a rock until depletion.
The completion bar means that you can cancel mining anytime already, and things like repairing tools already show a similar idea (Takes a certain amount of energy and gives a certain amount of completion over time spent) and most people who are going to mine a source are going to mine it until completion anyway. I rarely find myself needing just 5 ore, and clicking the same source over and over becomes tedious regardless of how you do it.
Even a toggleable setting, or one you can earn with mining III or something would be nice.