When 3 finger drag is enabled in System Prefs, instead of dragging with all three fingers as intended, it is possible to instead leave the 2nd and 3rd fingers motionless on the trackpad and then drag around with only the 1st finger, very much as you would a normal click and drag, but the drag also incorporates inertial physics as well.
Works for everything that 3 finger drag works on but adds inertia. It is particularly useful for 3 finger dragging of a volume slider because now you don't have to move all 3 fingers in concert but simply drag with the forefinger which is more precise for fiddly things.
This also allows super speed inertial scrolling because the normal 3 finger fast scrolling of the scroll bar is not inertial.
Works for everything that 3 finger drag works on but adds inertia. It is particularly useful for 3 finger dragging of a volume slider because now you don't have to move all 3 fingers in concert but simply drag with the forefinger which is more precise for fiddly things.
This also allows super speed inertial scrolling because the normal 3 finger fast scrolling of the scroll bar is not inertial.
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