If I could stress one thing to a director it would be this: You have looked at the resumes, hired the best crew possible so why not utilize their experience and skills during shooting.
Any suggestions from your team are made only to give you a better film. Don’t reject their ideas because you didn’t think of it first. You have enough to do, leave the sound to the sound mixer.
My personal theory is not to bother the director with trivial things; most of these can be worked out between departments. I only approach the director when the problem is serious and it is something only he can solve.