Currently the Significant Motion event works fine, but the problem is that there is no way to trigger anything when such motion has stopped or reduced.
There could two sub-options for the event:
1. Minimal - reduced thresholds (to trigger slight movements)
2. Inverted - No motion is detected (whether significant or minimal)
Copy/pasting my reply from Reddit as well:
Significant motion event works for me when I pick the phone or tilt it fast and much or slide my arm from one end of my body to another, all while I'm sitting in one place. I know, even I thought it was 'significant', but turns out it isn't. Hence, the invert/minimal contexts. My logic was, if, for example, significant motion triggers when I tilt the phone beyond (hypothetically) 30 degrees, then an insignificant (minimal) motion would be a smaller change in degree or space; and no motion could be 0 to say 5% change from the previous degree(s) or space.
I don't think you can invert significant motion as it's a one shot event to determine moving locations so as to kick in the main location algorithms. Detecting movement/user presence as mentioned in my link, would be useful if there is a low level, battery friendly API or something Tasker can hook into.
