IM Sorting Tab

Because I see many IM changes recently, I'd like to suggest a few more things.

First suggestion:
IM sorting tab, as I understand now, the chat are sorted by recent messages.

In the sorting tab will be many options, for example:
- A -> Z.
- Z -> A.
- Recent messages.
- Online members on top.

These are all the options popping in my head right now xd but i'm sure there are more options.

Second suggestion:
An option to PIN Messages in the chat.

Third suggestion:
An option to mark chats as Unread.

Fourth suggestion:
An option to PIN specific chats to the top.

totally agreed.