I've always had to manually add my made up system names (SNES homebrew, NES homebrew, Arcade Hacks, etc.) into the rocketlauncher modules where they ask for an msystem= or something like that. This is also why I don't update RL very often, because then it overwrites all the modules that i've done that too. I've heard about scrape as, or something like that before, but can't remember if there is actually a method that works. Would be interesting to find out.