Spiral Staircases!

Spiral staircases have always made sense to me for the game, especially since their floor space would be so much smaller than any of the other staircases. I assume the animation for them is harder because Sims are going in a spiral vs. a straight line? I'm not an animator, developer, or designer, so I can only assume that's the case. It also probably has the same problem behind it that the developers have with curved walls--the assets aren't designed to be viewed in a curve, and get stretched horribly like looking through a fish bowl. Granted, spiral staircase railings would be the main thing to contest with, but I'd imagine railings would be easier to design without fish bowl effects than walls and windows and curtains.

While on the subject of staircase variations, I'd really love L-shape and U-shape to be added as options in Build Mode. I think there are ways to make these when playing with split levels, but I'm unsure. I'd like to see them as options when choosing to lay down a staircase without manipulating the foundation levels. L- and U-shape would be much easier to design for the above reasons about straight lines.

Regardless, I'd really like staircase options that don't take up so much floor space. I also agree that being able to put closets and other things under stairs without cheats would be awesome. Space saving for the win!