I don't know if this is the right place, but I think it would be a good feature/preference: the title of my HTML file could automatically become the subject of the email.
The title goes unused in EDMs anyway, and this way you could update it when you're updating all your other code, not have to use a separate field in the CM interface.
Thanks for getting in touch and for the suggestion. That is a great idea, so I've just added this to our feature request list!
Thanks again, if you have any other details, please feel free to post them here or just drop us an email.