I would like to see an option in Opportunities Lists to filter by "no one" on the Assigned To! The same thing with Actions, and basically any other item in those forms. That would help a lot, and could be a different solution to this problem. We're finding that our fundraisers are forgetting to fill everything in, which makes our reporting inaccurate, and being able to look for blank items specifically in the various lists would help them track their work before we run a query in the database view.