It would be awesome if, when setting up automations, there were a check box for "Send Custom Email?" that opened up a dynamic field when checked.
If checked, a new menu opens that allows you to edit the From, Subject, Message, etc. fields in the notification email sent to users in the designated column(s) utilized in the automation.
This could be edited at any time, just like any other portion of the automation settings.
This seems simple enough.