My first vassal, when I needed food, couldn't feed itself. This happens regularly in RoC settlements, so it would be useful to know when scouting with specific needs. Seeing the normal HUD specs as you do for your own settlements would help. A possible alternative or addition would be the ability to abandon the vassal and let it continue to develop normally, and come back later. (I did turn on control for the vassals, but that seemed to cause funny stuff that I am putting in the help section.)