Add multiple (more than 2) fingers scrolling gesture

I want to use trackpad to adjust volume.

An approach is to use rotating gesture, which overwrites original rotating gestures, so I don't like it.

On Windows, I get used to adjust volume by scrolling up/down with 4 fingers. Magic trackpad supports much more gestures than those on Windows laptops (at least better than the one on my Surface Book 2). I hope this gesture could be used on MacOS too.

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