Really takes some spacial thinking to come up with this thread, congrats. Not sure, you can get some shapes the by clipping pieces together like we used to get arches and stuff. But out of the blue, how about the ability to distort a block shape into a Rhombus? These might be difficult shapes to snap too.
anyway my 5 cents.
So what you're really saying is I have no life and spend way too much time building things in this game..... guilty as charged. lol