I guess that bit about "mutual consent" was sort of a cryptic remark on my part.

What I was trying to say is that I generally feel everyone except the players should butt out unless there's a dispute. If I suggest that a particular game be played or offer "official" rules as a third party, I won't mind at all if the players agree to do it differently or plug a loophole. I think it's important for everyone involved to have that attitude.