It is very frustrating having to post common template elements for Auto responders and email notifications in Forms.
There needs to be an option for both to choose an email template. When you have chosen the email template. In that template you specify the content render region.
The WYSIWYG area then will render content in replace of that.
If there is a change in logo or head design for an email for a company you currently have to go through every auto responder, notification for all forms and a few other places to update them. It is a bit silly considering the scope of the platform and the fact you have email templates for other system emails already.