• Metal stair • Two-sided stone wedge • Pyramid top stone wedge • Corner pillar, like we have on slider rails • Grass blocks with grass on all sides • Vertical and upside down zappers, to put on walls and ceilings
Well, you're in luck! Metal stairs, corner pillars, and zappers with different orientations are accessible with Gepeto's webapp (see this thread). But the bad news is that they're a bit unstable (which is why they haven't been released yet), and the app isn't released yet.
Yea, you can technically rotate every single metal block... I think he wants for blocks like these ALWAYS be accessible...