This sounds like it would be better as a reader feature than a feed feature. However I am not aware of any extensions for providing this information to readers.
A simple proposal would be something like <comments count="23" last="TIMESTAMP"> and <score>72</score>. Then the reader could re-surface these items to you if they pass particular thresholds.
Of course there are some details such as ensuring that entries with recently updated comment counts appear back on the first page (or that old pages are scanned for updated entries).
Also I think WebSub doesn't work here because it excludes entries that have been seen before (which won't be an issue for your original proposal).
A simple proposal would be something like <comments count="23" last="TIMESTAMP"> and <score>72</score>. Then the reader could re-surface these items to you if they pass particular thresholds.
Of course there are some details such as ensuring that entries with recently updated comment counts appear back on the first page (or that old pages are scanned for updated entries).
Also I think WebSub doesn't work here because it excludes entries that have been seen before (which won't be an issue for your original proposal).