Allow you to walk on static objects
I would really like the ability to create our own paths in the game. I've used the rock steps to create a staircase out into the void in front of my Home. I would love to be able to walk out there for an awesome view!
Also, it would help for small changes in floor height, like putting a rock on the ground for you to sit on. Right now, if you put a rock down to sit on, when you sit down you clip through it. If you could teleport on top, it would allow you to sit on the rock properly, making for a more believable environment.
I understand that this could be a big technological challenge, depending on how collision and teleportation works in game. However, I would love to be able to do this :)