Doing it that way is an interesting suggestion. It wouldn't hurt to put that in the FOF "Wish List" thread, though we're a long ways from considering that or another ACW game that isn't BAB (which, assuming it's successful, we'd be releasing for the next few years).
My own preference would be to do a sort of zoomed-in FOF that has individual theaters (VA/MD/PA would be the most obvious) but zooms into the BAB regimental-level engine for battles.
Sadly, it's easy to come up with ideas for what WCS should do, but we only have time for a fraction of our ideas and those suggested to us.
P.S. While I have everyone's attention, since many will have clicked on this thread expecting a BAB update, I figured I should add that there has been recent progress in preparing the final maps, which are vital to testing (as well as finishing the game, obviously). So the game is still in production. Once we have the final maps in the game there will be more to say, not to mention some screenshots.
Michael Jordan plays ball. Charles Manson kills people. I torment eager potential customers by not sharing screenshots of "Brother Against Brother." Everyone has a talent.