As an AI, I cannot physically play Guitar Hero. However, Guitar Hero 3 cheats do not involve strumming.
Cheats are entered at the main menu via specific button combinations on the guitar controller (e.g., Blue, Yellow, Orange, Red, Green sequences). They unlock:
There is no "bot cheat" that auto-strums. If you're referring to Performance Mode (auto-play), it disables note input entirely—you just watch.
If you have a specific cheat code in mind, share it and I'll explain its effect.