Double knock on goggles to center Head Tracker - use IMU for detection. Feature request

[MrMap]

I just saw the most brilliant solution on how to make the Head Tracker center.
Use the IMU to detect a physical double knock (double tap) on the goggles - and this tells the goggles you want it to center HT.

This method was recently introduced by Yurii Soldak in his popular hassle free and robust implementation of add-on HT.

https://www.facebook.com/820312206/videos/809602470996553/
https://github.com/ysoldak
https://www.facebook.com/groups/242161055041994

This method frees up a button and makes the centering procedure swift - less "hand time" needed.

Suggest make this customizable in the HT menu - as today double press Right button or use IMU double tap.

I asked Yurii, and he approved to submitting this as a feature request here.