More Retaining walls.

Since i REALLY miss the sloped retaining walls from COI:E, i would really like to suggest that they should be added in the game by default.
That includes sloped walls, to make easier (and better looking) ramps, a medium sized wall (to fill the gap between the normal and small wall that are already ingame) and a wall that is twice as long as a normal one (also 4 fields).
And it would be good to have a "replace" option for retaining walls where you can change a normal wall for a x-crossing wall without demolishing the existing wall.