The latest patch is designed to make the sensitivity curve to be compatible with the Thrustmaster TCA Airbus edition.
Because that throttle quadrant, has the reversers at around 0-20% in the axis. The neutral zone is to determine which part of the axis will act as the IDLE position, while anything below the neutral zone will act as the reverse thrust.
Technically, on a standard throttle controls the neutral zone should be 0%. But on the thrustmaster TCA airbus, it needs to be higher (I think mine is set up at around 20%, but I can’t remember from the top of my head). That way, any input that’s within 0-20% thrust will be reverse thrust, while a 20% position will be 0% IDLE.