Building (blocks) Update?

I honestly feel mojang should have an update dedicated to new blocks and uses of them. Tagging back to Grian's video on the subject, some blocks need to be added (or should be). So if mojang were to take requests from the community on what blocks/ideas should be added, what would you request? What's it's use? Should there be stair and slab versions?

As an example to get you going, maybe you could request a stair version of the slime block to launch players diagonally. Maybe you want the option to connect fences diagonally. Brainstorm and tell me what you got! =D

 

That's possible with just 2 pistons and 2 slime blocks

 

I just imagine redstone artists would have lots of fun with a more compact way

 

Especially when mojang tried to copy W/E