Perhaps a function that allows you to mark all threads as being read. Since I seem to have to stay in a thread for more then 10 seconds for it to register as read, it can be time consuming. I know that you can tell which ones are new but it would still be easier to see which ones you haven’t looked at yet if this function where available.
Its done automatically. So - when you read something it records where you left off - and then when new messages come up it automatically shows you the new messages.