The problem bugging me is that every time BTT updated to new version, it wipes out my setting.
Especially Three and Four Finger Double-Taps: Doubletap delay 0.5. (You can find in BTT Setting > Trackpad > Taps)
So I have to manually adjust the Doubletap delay to 0 every single time.
I am looking forwards it being fixed in the future.
Thank you for reading my concern,