Retaining walls are really tedious to place

Retaining walls should have a drag placing mode like pipes, rather than having to place individual segments and corners, which is very slow going.

agreed, but leave the bits and pieces for finite placement for when the drag and drop doesn't work.

Yes. And I think the wall should look continuous instead of the separate piece look. Reminds me of the top of old castles. It doesn't look right in this game.
Also, I think the land should be adjusted on the side of the water so I see a vertical wall down to the water.

Ok, I placed the small wall pieces the wrong way. Oops.

Possibly add a t2 mining control building that builds the retaining walls as it mines (consumes materials).

I like @Charlie [ideas]'s idea that would be very useful

Yeah...Charlie's idea would be cool. I like the OP as well.

Basically build barriers and retaining walls like pipes. It's very tedious if you want to quick deliver a long wall and you have to click on every section and then click on quick deliver.

I agree with this. It would also make it much neater if you could place the retaining wall on the side of the dock or pier, but currently you cannot build on top of it, for example cannot place a seawater pump over a retaining wall.

I agree with both the OP and Charlie on this one.

I usually place 3 or 5 then copy and paste them but corners are tedious especially because many times its hard to see which way the corner is oriented.

I find a planned pipe works better - bonus is you don't have to actually build it

Being able to drag and draw full rows of wall segments at a time would be fantastic. You can even remove the corner, T, and cross segments completely and just have the wall segments automatically snap in place at corners and intersections.

Could see this idea really fantastic!

@Andy Walker: agreed!
@Charlie [ideas]: Not at all in favor of this.

Hasn't this been completed?