[bbradley406]

One of the common modifications for controllers is thumb-stick extenders that simply make the analog input more precise, not "faster". I don't think you can detect this using your strategy, since there is no change to the electronics of the controller. To the console and game software it just looks like the player is more accurate than others, and reducing the in-game look and movement speed wouldn't remove the advantage.

Some combination of heuristics (target acquisition time, moving target tracking, etc) would probably be the only way. But what if a player is genuinely exceptional - should they be punished for that?