Our users' in-app notifications are now so plentiful that they are essentially useless. It would be great if the users were able to turn selected in-app notifications "on" or "off" in their User Settings; ideally, the interface would be modeled on the one that is already in place for customizing Email Notifications.
(Frankly, I was surprised to find that we can only customize the Email Notifications, and not the corresponding in-app ones...)