Sometimes I use double click of the pick and sometimes I click the rock or hit enter. The maximum allowed distance needed between the Glitchen and the rock when using double click of the pick seems (sometimes?) to be shorter than that when using other methods and it gets kind of annoying. Even when only double clicking the pick, your Glitchen backs up when mining and it's necessary to get closer to the rock to mine again.
My suggestion would be to change this so that mining is easier (especially when mining with multiple people around).