Comment by bargainbin

First thing I checked for! I feel like it's such a niche feature but also distinctive. It's actually a "necessity" for a proper Gamecube emulation experience, which has the two stage shoulder buttons.

Like you, I also used this for boost on Rocket League and it was surprisingly intuitive. You can map it to the triggers lowest threshold to emulate it but without the tactile bump to rest against it just won't work.