Rut, I agree with you when you say "one size will not fit all." But the reality is many officials do not have enough experience to know what to say to coaches. This being the case, I wouldn't suggest anything other than being direct and clear - this only applies to questions not comments. Is that so hard?
I know right off, "Thank you" will not work for me. I make every effort to only call things I have no problem explaining. I don't know where I am on the scale of smooth communicators, but I think I can answer a question concerning one of my calls. If a coach becomes a problem...I have something for that too.