Try and get a copy of dynasty dissected. That'll show you loads of drills. My point still stands though. Your thinking too much into this muscle memory rubbish. If its just technique you mean then yes it will help as it'll keep a marker in your hand and keep the coordination you need to perform such movement live in your head. Shooting does matter, if it didn't then paintball would be even more of an unwatchable hobby than it is now. You need to be shooting proper paint at a proper FPS to get any benefit from and training.