New track pad gestures request

Here's a request of adding「2 fingers swipe up/down/left/right (with thumb fixed) 」,
thanks! =)

Isn't that what the pinch and zoom with thumb and two fingers does already?

Ah yes! These gestures are quite similar, sorry I didn't notice that...:see_no_evil:

I meant to add some more navigation gestures to my BTT, but it always conflicted with existed ones...:see_no_evil: