I'm suggesting an option in the ". . ." drop-down menu to be able to bias a given search towards results similar to the selected result.
For example, if I make a search query and one particular result is from and old blog from 2009 but has the most relevant information, I could select the ". . ." drop down menu and click "More results like this" to re-run the same search but biased towards similar types of sources with similar types of content.
I understand that this isn't a simple request, but I could see this being beneficial for many users across a wide number of use cases.