I completely agree, the skirmishers are not acting as they would historically. I really want to like this game. The look and feel are excellent. I think that potentially it's outstanding. However, having such an important detail as skirmishers being able to massively influence the outcome of the battle such as Gettysburg renders the game less than useful.
Skirmishers were much more highly utilized and Napoleonic warfare and they were in the Civil War. But even in Napoleonic warfare, skirmishers would not have been doing the things I seen them do on this map.
Again, potentially great game.