It would be helpful if search results could be filtered based on whether or not the record has been attached. I don't know if this has been suggested before or not.
I think it could be an easy feature to add to search results.
I am currently working on a project to match the death records in Philadelphia to burial records in the city for one surname. When I am forced to refresh the search page, the results are often not in the same order and I am forced to double check each result. This could be avoided if I could limit results to only those that have not been attached.