Hi Scott,
I like your idea. My use case is know how transfer cross different departments. Like from Development to Purchasing and Quality.
Here I have often the request to generate tables for overview and yours is a very good possibility to get a concept the people can work with.
My idea a few days ago was something like this Idea of multi field data tiddler like a data base - Discussion - Talk TW (tiddlywiki.org).
But If I look to you examples I think it would be an excellent extension to the existing filter expression.
I will follow your concepts and the implementation 
Stefan