Okay - I'm an Idiot.
I found the field to edit the Subject of the email, and worse, we already us it.
Although, all it does is append to the canned "Process completed sucessfully" or "Process failed" subject field.
I also found that in R-Drive Image v4.7 Build 4700 Mar 08, 2010 Revision History is says:
"* The sender, subject, and message body fields in the report mail message are now editable."
What I can't figure out is how to do it.
Some guidance would be greatly appreciated.