Rated 4 out of 5 stars

Please add:
- "Exceptions" feature - to exclude certain pages /sub-directories from scanning;
- Ability to scan local copy of the web site

This review is for a previous version of the add-on (3.01.1-signed.1-signed). 

Not sure yet whether local scanning will be possible, since it won't be able to use XHR to make requests, I'll have to see whether it can work with files through the directory structure instead.

For exceptions, that certainly something I'll look into. In the meantime have you looked at the Spidering preferences -- you can program exceptions there based on the value of "rel" attributes in HTML sitemap links.