@RyeCris16
Great requests for floating foundations and water emitter in pools (I want the same thing, or new emitters that will sit properly in them).
As for removing the stair walls, you can sledgehammer them. It destroys both walls, but you can then manually place walls around them. Of course that does mean that the replacement wall extends out further than you may want it to. Is that why you are asking for this? There is currently no way to remove walls on a gable roof, so I could see wanting that for perhaps creating some cool effects, but wouldn't being able to sledgehammer them work just as well? Are you looking to remove individual wall tiles or all of the walls?
And regarding placing stairs over stairs, you meant in the case of floating stairs, right? I think that the problem with the stairs over stairs is that it doesn't make sense for the non-floating stairs, and I don't think the game knows the difference between them. Might be a tough one to implement, but we can ask.
I'll be noting the glitches in the index soon. I had experienced that doors/windows disappearing bug before but couldn't recreate it, so I never noted it. Now, you've given the steps to recreate it, thank you! However, when I tried your deletion method to resolve the glitch, it worked one time, but a second time, it did not work (even though I'd deleted both 1 tile rooms).