This conversation has been merged. Please reference the main conversation: Lightroom: Catalogs within Catalogs (or Master Catalogs)
Having a "master-catalog" displaying ALL photos would be great if there were tools like face detection etc. Looking for that one great photo taken sometime at some event might just be easier to find if you could view all photos.
Network support for mapped network drives... PLEASE. Maybe a "check in / out" option for working on a shared catalog to give a person read only access if someone else is working on a catalog?