I think what you mean is like spiral staircases, staircases that bend at angles, and staircases that at the bottom has another next to it going in the opposite direction to the next level? I came across this irritation the other day when I wanted to make a staircase that went downwards to 2 levels with them next to each other, but the game wouldn't allow me to build another staircase so close to it. A "floored" (flawed) design if you ask me.
This is the design I was trying to get:
I'm just thankful none of the stairs look like
this. Could you imagine trying to walk up and down these? If you were left-footed you'd be stuffed and doomed to fall down.
But I wouldn't mind in real life a staircase that looked like
this!