The central idea in my comments above is really based on the first rule - remembering that it is a human on the other end, a human who is limited to only words in their attempt to communicate, words minus expressions, gestures, or tone to give meaning.
I believe it is time to pull together the suggestions made here. I propose that I should create an initial draft of rules, run them past the other admins, and post them on a permanent page reachable from the About pages.
Just as the current admin team is provisional, so should we view these initial rules. The membership will be expected to follow them, and the admin team will enforce them.
Keep in mind these rules are a beginning, not an ending, and will be subject to discussion by the whole membership and modified if needed.