Is it possible to move a window while holding down two fingers?
I want the action to be triggered while pressing, not when releasing
This is not possible with BTT as the mouse cursor doesn't move if two fingers are touching the trackpad.
You could use a gesture that triggers "on touch" to start the moving and then use the "On Touch Release" action category to stop the moving, so you could start the gesture and keep one finger on the trackpad to move the window:
If this is about the magic mouse, then you can do it by using the "two finger touch top" gesture.