To be honest, I'm not 100% comfortable with this proposal, for reasons that aren't entirely clear to me. I'm gonna think out loud here for a bit, so beware; what follows may not be entirely coherent.
So there's rules, one the one hand, and there's that thing that they talk about in DMing blogs called social contract. I feel like "no Pvp" is a social contract thing, and the proposal mechanism is a rules thing. Rules, we need everyone to be using the same set of rules, but... the social contract in place for Closed Eye, for instance, wouldn't be appropriate for many groups. As a DM and a player, I'm not really interested in exploring intraparty conflicts in this setting, but as a judge, I don't know that it's within my duties/prerogatives to tell some other DM and his players that they can't have PvP if that's what floats their boat.