So the game I was planning to run is Mario Party. The category I was going to start is credits%, which requires the player to obtain 100 stars throughout the course of the run. The dumb mechanic of this game is that it doesn't award stars that the computer players have picked up. The solution for this is to switch the computers to players so that the game gives you the stars. Which leads into my question. Is it considered cheating if I map all four to my one controller? Or can I just activate the controllers and use no input on three? Having four controllers reduces the run by several hours. Please let me know.

As long as you aren't controlling more than one character at once I personally would allow it, but I think in Mario Party you do during minigames.