John,
The stop sign is
one tool that can be used to work with coaches. It is a good one, but not the only one. For me, the stop sign is my FINAL warning. Once I say, "that's enough coach" and give the stop sign, any further barking will earn a T.
I'm fortunate to work in an area where coaches have
no input to ratings and we do not have a scratch list. Hearing that coaches have input and can even scratch a ref in other parts makes me feel very fortunate (actually, it makes me feel like we do it right and I feel sorry for refs in areas that have coach input).
Z