Slab signs/half-signs

I propose a new set of sign blocks, able to be placed on the edges of slabs, with only 2 lines of text. I think this would make room and area labels much nicer looking, and allow a sign over a doorway or passageway even if there's only a slab height over it. You should be able to place them on the side of a fence post one on top of another and have them not connect, for crossroads markers. Additionally, I think there should be a one line placard that can be placed on doors, maybe with metal variants.