Not sure what you by 'scenario set up rules' but the whole scenario section in 2ed is exactly the same as 1ed. Sorry.
I always thought the scenarios section was one of the strongest. There are what, about 13 scenarios with about another 13 different deployment options. That makes for a great variety.
Having now played a few games if 2ed I can say that it is a much tighter, less sloppy, version. It's what 1ed should have been from the start.
However, the two editions are not compatible. Essentially the same mechanics but a lot of the abilities, and the most common ones at that, have substantially changed or been completely re-written, meaning the two editions can't work together.
It is now an excellent game.