perhaps this comes down to a difference in opinions but I think that the nzb backup folder should contain the backups of all nzb's not just dirscanned nzb's.
The explanation (default ui) for the option is:
OPTIONAL: .nzb Backup Directory:
Specify a directory to backup .nzb files to.
it doesn't say anything about dirscanned nzb's
I shouldn't have to save the nzb and then add it if there also is the URL function.
Also SabNZBdStatus (the FF add-on) uses the URL function.