Hi. In emulated Wii Remote setup menu is the "Upright Hold" setting. Under it have "operating threshold". In addition to the fact that there are two threshold options, and it is not clear what is responsible for what, none of them changes the trigger threshold. In Wx there is only one option in this place, and it works - changes threshold "Upright Hold" (although it is not saved when you exit or start the game 
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Build 5.0-7919
).Build 5.0-7919