Problems editing large scenes

I'm having a bit of problems creating large scenes, that are supposed to use the entire screen. One thing is that I cannot create scenes that are larger than the screen not including the lower android buttons, but in addition to that they are rather difficult to create and edit, since the scene editor buttons are made invisible if the scene is to great. Would it be possible to edit a scene in for instance 75% size?

Also it would have been great if apps using scenes were handled by Android as other apps, and not only as dialogs, in which they are closed and disappear if you change app or simply press the square buttton