As far as I can tell, there are at least 3 keystrokes necessary to dig, and at most 4. If I have a pickaxe equipped, I can 'U'se it, select a direction, and then I'm prompted to select "a" which is the only option to "Dig through the wall". I can see how this interface would be necessary for some things where you can interact with an object in more than one way, but it just seems weird when there's only one way to interact and I've already had two chances to cancel the action.

It would be nice if the number of keystrokes were reduced for simple actions that are likely to be repeated.