A very good idea. But I think until (if?) we are able to break up our little army into smaller units which we can bark separate orders to, I don't know how useful arraying troops would be. I mean, whatever the initial position, they're not going to hold that array once the battle begins.
Edit: On a further point, I think the AI would be mightily overpowered by human players, unless armagan works hard to build in a chess-like tactical intelligence into it. For multiplayer, however, it would be very enhancing.