MB...I understand what you are saying. I don't know of any crews in my area that have a book on the field. That is not to say that they don't, I am just not aware.
I do see the value of having one to ensure a ruling, odd situation or enforcement is correct. I get comments from coaches and wonder at times if they have even read a rules book...the one I hear the most is he was outside the tackle box, that can't be grounding or it was un-catchable that can't be interference.