I think competitive moderation will be a great addition and necessary for Member (and Memo) as the platform grows in users. I think we'd address this by adding some protocol actions to nominate a user as a moderator either for a specific topic, or site-wide. Members should also have an ability to rate actions as spam, and users as spammers, so that neither should appear when other Members are viewing a topic where that Member has been nominated as a moderator.