Is there anyway to tell who has entered/exited the chatroom?   Or essentially a way to tell "who" is in the room?  Is there a way to have multiple rooms, private rooms or password protected rooms?

I thought it was really good and I like it.

There are no rooms in the mod, it's a shoutbox, not a chatroom. And there's a feature included "Who's chatting" which shows the members using the Shoutbox.