Vertical Slabs for All Building Blocks

I have been playing this game for a long long time, Slabs exist since very early versions of the game but what would make the game more even and better designed would be Vertical Slabs, it would make more sense for them to exist since they can make buildings more even and symmetrical where as normal horizontal slabs lack the ability to! I think it would be a great asset to creatively using building in the game and assessing new ideas !