I haven't used the two together myself, but friends who have comment that they start Sauron at 15 rather than 12 when they do.
However, I generally recommend either ignoring the military victory for F&F or else using the special new Foes card that increases the count by 8 by recycling some of the tougher foes. I talked about it in my review of Friends & Foes last week.
http://www.rpg.net/reviews/archive/11/11935.phtml