In the past, I have used AutoHotKey to provide quick comments to my students papers. You can use the program to easily include a pre-created batch of comments on your student papers without copying and pasting. See my presentation: https://docs.google.com/presentation/d/1RohMSl9xyZLuky6L-fOJfCGyD2OSeKR9hjZiVGhymXY/edit?usp=sharing