Email Template - Insert Header or Footer to each Template (Same for All)

It would be nice if you create a default template that each email template uses. That way you can have the specified header and footer as the original base to any email templates for your workspace and then any of the relevant details for each template is what is edited in each template itself. That way, you only ever have to edit one templates header and footer or default fields if anything changes, rather than go into each individual email template and update the formatting.