Good tool developers are among the hardest to find people in the games industry. It is a field that is very often overlooked, yet is required for every big and even ambitious small projects.
I would love to see a course showing how to write tools, monitoring things like AI behavior, cheat specific states in a game for debug purposes or automate workflows. It is a tough field to fiddle yourself into and having a well-explained introduction course would be very beneficial for everyone interested in this field.