I teach programming, and it is painful to watch my students slowly arrow around the screen, backspace over something, then retype it. It would take less than a second for him to have grabbed his mouse, double-clicked the word and started typing the new word, all without looking down.
I taught them about editing and keyboard shortcuts at the beginning of the curriculum, yet they do not all take everything on board (who does?). So now months later I am left with the question of whether to urge improvement on them like a mother bird, or just let it go. As programmers, their time will be valuable, and their enjoyment of work improved by the ease of getting work done. But is it up to me to reinforce this after having made it thoroughly clear early on? This is not just about editing, but all sorts of practices like naming conventions, coding standards and so on, which I did in fact present already and have said that the industry expects these things. Editing is simply one obvious example.
Addition: It is not for me to dictate how students should work, but I would be remiss if I did not point out better ways to accomplish things. The question is: to know if I have made the point or when to stop trying to make it. "A word to the wise is enough", but how many of us are wise, especially while learning many new things at once? An example of coding standards is a student who doesn't like Properties. Well... They are useful or they would not have been invented. I couldn't convince this person.