Speaking of the savegame editor, what's the 10th skill - "Infiltration"?
I can't confirm this, but I think it's a skill that the game calculates behind the scenes based on your play style and how stealthy it is. I noticed a couple parts in the game where you sometimes get a special extra dialog choice 'infiltrate' that will allow you to accomplish two tasks in a mission where it's usually an either/or situation. Sadly it doesn't show up for the Rome - Madison scenario.