CiviMail has an option to insert headers and footers at the top and bottom of a message (Mailings > Headers, Footers and Automated Messages). Is it possible to use these as a default for all "System Workflow Messages" Message Templates (Mailings > Message Templates).
The default templates are necessarily quite plain, and while I know you can edit each template individually, it would save time to be able to insert a common header/logo on all system templates. Changes to the header would apply to all templates at once, and future upgrade-related improvements to the message templates wouldn't require reverting and re-editing if all you had done was add the logo at the top.
If there is a way to do this, I am not familiar, so I realize this may be a feature request. If so, I'd appreciate tips on where this change would need to happen and could add it to my (ever-growing) rainy-day project list.