That would be my bad, then, since it was done in Marina and I thought the function had been continued over since nothing had been said about it having been done away with.
But this actually makes using the mixed option even easier. They don't have to lock the comms if they aren't locked right now and can just let visitors know ahead of time that if they want to make posts of their own they need to sign-up, but it's not necessary to do so. It makes the posting and sign-ups an opt-in function that doesn't affect participation in the 4th Wall, it just becomes an addition for those who want the full-on Marina!newbie experience.