I apologize if I don't know enough yet about the 3D aspects of WME.
Is it possible to make the sky actor a scrolling rectangle around the whole scene, so it goes around not just the starting screen but the rest which is initially out of view?
Alternatively, if that skews the perspective, can the the sky actor be shaped on the sides and "front" like a rectangle, but have the rear (behind the mountains) be concave to keep the bowl-shaped look on the sky?
If I'm completely misunderstanding, I'm sorry and I'll keep reading the thread to learn. =P