This would also be great for grids, selecting a record in one grid to filter a second grid would allow for really helpful visual navigation of projects and sub tasks while allowing them to be grouped by say quarter in ways that lists don't support.

A couple ideas on how to solve this… but just a note at the top, your ID system probably just needs to be rebuilt. The initial system already breaks legibility in your example… so the usefulness is pretty erm… questionable. Seth / Scott = S. Howard /...