Allowing the screenmaker to alter the landscape and add scenery, wil prove that he/she has an eye for composition, angle placement, proportion etc. The Nations MSC wasn't only focused on the
editing of the screen, the angle itself mattered as well. The new Canyon environment allows for beautiful geographical edits, so I don't see why you shouldn't be allowed to do so.
Space says:
because it will matter much more than the actual screenediting?
That will leave only the screen-editing elite to have a chance on winning.