Thank you! I really hope the plugin based scraping architecture will make the extension popular in the long term.

Regarding your suggestions, I've opened a couple of enhancements:
https://github.com/get-set-fetch/extension/issues/61
https://github.com/get-set-fetch/extension/issues/62

You're correct about the ScrollPlugin trying to perform infinite scrolling on either all pages or none. But it stops after a single scrolling action if no new content was added to the page. This behavior can probably be improved though... Will think on it.