You can't eliminate bad behavior by making more rules. By the time you get to reportable problems (be it smearing or down-throat-jumping) things have gotten way over the line. What I remember from the HTTP-WG (which had lots of newcomers) was to set up discussion with a short presentation on an issue, and to call on people with hands up sweeping the room from left to right. No mike hogging, ask everyone to start with their name and affiliation. (I suppose in a virtual meeting you could let people speak in alphabetical order.) Make sure questions or issues are understood and answered. Some amount of reinforcement that newcomer's misunderstandings are often failings of the work documents to adequately explain their design.
