You still can close the chat whenever you want like this you will not be disturb by the ping or people talking in the chat :p

It's actually something in developpement, you will be able to see that more soon ;) as on EU you can with the transfiguration books ^^

You can delete every account that you want by sending a private message from that account to your minister of magic or headmaster ^^

In part yes but not only, especially for teacher and yes to see copy homework with DC, but to see and can correct any grade that the teacher want because of a Troll homework and to allow him to see how students answer at his lesson and know if he need to change/clarify something.

But Thanks I haven't see the other before, because if I've saw him I just will add comment on it ^^

Oh yes sorry, but I'm not sure that is a good idea.

Even if Prefect can come in every private topic, the websites will lose a part of his soul, we will found a lot of private topic and really few public topic and it will be really sad.

It already exist some method to be alone in a Topics, when you have well construct your RP, it's impossible to people to come without do something unrealism, so in this case they just have to contact prefect or the prefect leader to suppress the post. We have really few people where when they do a topics they are disturb by another person, or only when it's someone which don't know the rules of the websites yet.

I just can give an advice if it's really decided to protect RP with a password why isn't just the scribing part?

Like this it’s possible to be read by everyone, but only person who possess the password can write on it?  

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Private topics are prohibited. Everyone has the right to participate in the public topics that are created.
If one wish to have a private conversation, this must be done in an owl.