I guess a big thing is being able to see where the edges of the screen are and being able to extend the scene so you can setup for a side scrolling game. Is there even a way to do scrolling right now? A particle editor inside the level editor might be nice as well. I cool feature that Unity has is how you can parent an object and the child object will always say in the same relative position to the parent object. I think you can already do that but I haven’t really tested that exact feature I guess.