I recently created a hack which enabled rumble for flashcarts in Pokemon Pinball R&S, so I have the knowledge to hook pretty much any function to rumble at this point, so long as I know the address of the function to hook. My next idea is to try hacking rumble into a game that didn't already support it, and I just so happen to have read a blog recently that included the function addresses of both Link getting hit and dishing out damage. With this it should be relatively trivial to add rumble under those two conditions, but I am personally not all that interested in this game on GBA. Does anyone care about this? I may mess with it anyway, but public interest will definitely help with motivation.