There's a lot of overthinking here! This feature doesn't even exist yet!

So why are we basing opinions on what it COULD be?? It doesn't have to be a full-time job, so how often a member visits the model or how long they are in the room doesn't matter. Models don't need a moderator every second they are online. Not every model will need a moderator at all! This is just an additional tool that could be available, not a requirement. These discussions are great for determining what parameters need to be set, though.
Maybe moderators are only an option for the model if:
1) Guest chat is turned off
2) A certain number of registered users are in the room (50+, 100+)
3) Only in Party
As others have already said, the model will have to trust the mod, because there are no restrictions on who and why someone can leave a review of the model. If you have a trigger-happy mod who mutes or bans people indiscriminately, it won't be long until members start expressing their frustration about it in the model's reviews.
One thing that I don't think has been mentioned yet....would or should the moderator be able to see what is whispered to the model? I say this because recently I saw a model post on twitter about the abusive messages they were receiving, and the member was only sending them via whisper. I would guess that this is not uncommon. Not necessarily that abusive whispers are prevalent, but that there are beggars, excessive compliments, etc that are flooding the model's side of the chat, making it very hard to continue chatting with the "normal" people. Also, should the moderator be able to whisper to members? This could be used for warning members about their language, comments, or begging without doing it in front of the whole room.
If this tool were to be used, I think it should appear in the chat similar to other actions in the room like "A user submitted a show offer," "XXX Cleared the Chat history." So it would be "XXX Model has assigned a moderator to the room," and maybe the member that was assigned as moderator would now be able to toggle between two chat screens, one where they appear as their username when they chat and another where they can see whispers and appear as "Moderator." I imagine if moderators appeared under their own username, they would gain a reputation and abuse. It's a complicated idea that would take a lot of brainstorming and decision-making by Flirt, but the way that it is now, I think it's a good idea. Take away the ability for all guests and basics to chat in rooms??? That would be a different story.
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