Hello there,
This is an idea I saw some time ago but I re-did it.
The idea is of a place able queue that would function like a wall. It would not allow zoning on it but it would have the following versions(types):
Straight center
Straight left
Straight right
Corner
Straight center would be a queue is the center of a grid peace
Straight left would be a queue in on the left side of a grid space
Straight right would be the same as the line above but all lefts are right
Corner piece would be a piece that you could place a a corner. This could also be automatic like with walls
Lastly, they would 1/2 or 1/4 of the price of walls, and because they are reusable they would sell for the same price! They would be a cheaper wall sort of thing.