Well,

Not so much templates as sample content with fill-in the blanks.

When I have to inform a customer of an item that is back-ordered,
It'll always be the same email with model number changed.

I'll be sending this email from Admin>Tools>Send Email using the HTML editor

A nifty thing would be if I could choose a predefined file from a dropdown and have it's contents place into $EMAIL_MESSAGE_HTML

Which would leave me with only to fill-in the blanks.

Has someone invented this functionality ?