D:OS 1's editor did have a camera toggle...
You could view in-editor exactly as you could in game. I think it's the 3d glasses icon on the bar but I'm going from memory.
I think he meant he wants to see that view while simultaneously being able to sculpt the land and paint the terrain. In the DoS1's editor, clicking the button you are speaking of 'tested' your level and let you control the player etc. -- NOT continue working on your environment in a much easier to navigate view.
