Having a day/night cycle in the editor like crysis sandbox did would be great XD. One thing I would like to see also is the ability to change the view distance inside the editor. I imported a very large model into the engine the other day, and couldnt see from one side of it, to the other. Maybe this is just because it was one large mesh? and not a lot of seperate meshes? (i had the current view distance set to "infinite" also, but this didnt help)
Another thing I would like to see is the ability to change the cubemap strength. At the moment it is too strong for what I need.