BUG: When you start to charge a JUMP there is a big deadzone before the charge in represented visually.
That deadzone was intended. it adds a check, if the mouse is inside that zone, before the mouse tracking applies. It is there to make sure the mouse has teleported, so the "initial aim bug" does not happen.
It did help a bit, but it did not get rid of the bug completely.
But he absolutely did wing the values of that deadzone. he basically just guessed how far the mouse can move in a frame.