I am missing a way to easily identify if a building is using its full staffing potential. You can see this for enabled work slots, but not for unenabled work slots.
If you have lots of buildings and build anotherone, you may forget to enable all workslots. If you do, there is no way of knowing exept clicking each individual building to have a look.
Imho I think it would be excellent with a small icon on the building letting you know there are unused workslots that has not yet been enabled.