From user perspective it is super annoying to add message templates one by one in the create/update form.

Another annoying thing is that if you forget to add 'message templates' for Email media type that is used in e.g. trigger action, you will get an error during the event about missing message template. Of course this is a misconfiguration but it is not intuitive for the user who setup things for the first time.

Suggestions:

1. 'Select all' option in 'message templates' form
2. Maybe for Email media types 'message templates' could be already selected when user is creating the media type.