But I cannot abide FI's whose hands hover 2 inches from the controls during the approach and landing, especially on check rides. Either take control and explain why you're so nervous, or sit on them.
...hmmm, yes, I'd agree in principle. During my FI course we spent some time looking at the point during an approach where you might consider taking over. A student will never learn if you take over all the time but you want a) not to bend the aeroplane and b) have them suffer loss of confidence 'cos they can't get it right. I admit my hands DID hover the other day but it was the student's first-ever actual landing after only 4 lessons, made a good job of it so I'll back off next time. Generally, however, it's hands folded in lap. Students notice when you move them to just above your knees in anticipation!
I believe the RAF spend quite some time and effort in determining exactly where the turn-back point is for each aircraft type; there obviously is such a point but we don't teach it. I had a couple of friends in a Jodel a few years ago that suffered an engine failure at around 500' AGL and they successfully turned back, but they were both very experienced instructors. You're generally better off with the 'land ahead' deal as an SOP. Pushing is still the single most important thing to do to save your life in an EFATO.
TheOddOne