What does a jitter modded controller do?

Answer 1

The jitter modded controller is the rapid fire mod. It allows the RT trigger button to be repeated even when still pressed down. Let me give a example; When shooting a pistol on a game, you will need to press and release your RT trigger and press again to shoot several times. With the rapid fire mod, this will simulate the action without the user doing so, the user only needs to press down the RT trigger.