Separate the attachment management from the Issue Update event within the notification schemes, allowing users to set up permissions relative to adding and deleting attachments - similar to how you have broken out comment management.

We can get spammed with email when a user adds one attachment when using Safari, and it adds all the other images as attachments - sometimes creating 15 random attachments. Consequently, since there isn't a mass attachment deletion feature, we have to delete each one individual. And for each deletion, it sends out separate notifications.