It would be nice to have and correlate Rules (Conditions) under Notifications aside to Event. Ex:
Notification to the Dev group with specific template will be send on New Ticket (Event) creation If category = "E-mail" and group = "DEV" . With this kind of setup it would be much easier to manipulate with notifcations and situations in which a message should be sent from GLPI.
Customer support service by UserEcho