Quay Chunks for Docks

As an additional branch off of the retaining walls would be Quay parts to help make the dock areas look a bit more industrial, they could double as an actual coastal defence for areas where we are mining the sand or maps with below sea level. as a Secondary issue the cargo docks and main ship dock have a massive area of clearance to the sides of it which don't seem to be used by the ships being able to snap them to quay pieces would help keep a space but not be too extreme in the space needed.

Or let us use retaining walls as Quays. We should be able to place them near water.

Retaining wall behavior is weird when touching water. I tried to make a canal that was using retaining walls as sides (ground excavated on the canal side vertically to -3 level).
On one side the retaining walls were touching the water just fine and on the other when excavated the same way just collapse.