Alex suggested to have a hotkey cheat sheet. Meaning, coming back to a game and forgetting the important keys for a screen, make a default key (such as Tab), bring up a window while held that shows the relevant keys for that screen and what they do. That way they don't need to be looked up in the configuration. Since not all keys are needed on all screens, it may give hints on what a screen can do that the user might have forgotten.
