DB6 the only reason you are doing R & B in a light aircraft is cos you are training bods who will be doing it for real in jets.
IMHO the run & break has no place at a civilian airfield full stop. It is simply a pose. A Yak 52 is fully capable of flying a standard circuit as is a Delphin given reasonable forward planning. If a person can't plan that far ahead then they shouldn't have the stick in their hands. I fly for fun, I enjoy a fast low pass (well slow pass in an Auster) but I don't enjoy unexpected manouvers when I'm getting ready to land.