Allow users to choose if additionally to the regular notifications, they would like to see an alert about every message reply as if it was a direct message.

To explain it a little better, right now I can only see  a user name in BOLD in the DIRECT MESSAGES (left pane), when that user has written something to me.  I would like to have the option to also see that name in bold when that user has created a new topic or task or replied to a topic or task or mentioned me.  And when I click on some icon, next to the name (in Bold) of the user in Direct Messages, it would send me to the notifications section but filtered by only that user.  This way, I could chose which users notifications are more important to me so I can see them first.