Ok, I see what you mean. My idea was simpler:
If I start editing a book from the library (not inside the editor), first make a copy of the original and name it as original_epub and then open the epub file with the editor.
(If there is in "save_original_format tweak" an additional entry like "save_original_format_when_editing= true").
But this is nothing what kill my workflow, as I make today an additional copy of the book in the library
