Are questions asking about a feature of an emulator solely be on-topic? According to the fourth bullet in What topics can I ask about here?, "game-specific hardware and utilities" is on-topic. There is also a tag emulator, which strengthens the hope of being accepted, but since I only use the controller to control my computer, not to play any game, I think it'd be better to ask here first.
Below is my sample question.
What do the negative/positive throttles in the DS3 trigger buttons do?
I have no idea what is the difference between the five options of throttles. In whatever choice only one button is triggerable, be it's pressed slightly or held long.