This is a bit of a followup from the Twitch modeliing demo.
From my perspective, the Flip along description is not intuitive, flip across would make more sense (I expect an object to flip across an axis for some reason and maybe tumble along an axis).
I have put in a lot of effort developing my visualization skills (picturing the movement in your mind) which I find is required to be consistent in using flip along.
Visualization requires effort, but my brain is generally busy with other concurrent modelling challenges
so I am only 75% successful when using flip along (not acceptable from a Pro app).
A likely solution - add visual helper (translucent image) to indicate how the component will flip as you hover over red, green or blue. I would expect 100% success rate using flip along then.
EDIT: there may be extensions with similar function, but I am not aware of them, and SU would benefit significantly from built in function.
In implementing this type of UI innovation, it could lead to many other UI innovations that can speed up modelling.