I would love to be able to build a casino building using walls/ceilings/decorations from an external perspective much like The Sims. I know that is a lot to ask as there are other game aspects probably needed at this time but in the future I think this could be a really good addition.
I love building and designing games where you can build the shape, have windows or not, dome/spire/flat ceilings etc and maybe add gargoyles/lights and those type of outside decorations that make up buildings. A few available textures for wall types and colour.
I think it adds another element of the whole casino building/tycoon experience and would bring a lot of joy to CasinoRPG.