Option 1 is not the same.
I can add a filter but if I add a filter like
not Title:"2nd edition"
It would not show duplicates for
2nd edition, 2nd-edition and 2 nd edition
If the option was provided in exempt, it is provided on the plugin and on run-time. So 2nd-edition would match 2nd edition and show it because it is a new book.
It would also show new books with 2nd edition because your exempts are set based on books. New books would not yet have the exempt flag set (the flag is set on books at the moment I add a tag, not at every time the plugin runs)