Strategy -- the science of directing operations prior to the actual engagement of the enemy.
Tactics -- the science of disposing forces in action.
So what you are really asking for is a Real Time Tactical game (which is what I would consider Praetorians). Tactical games allow you to move formations around for different effects largely because you don't also have to manage a gigantic economy. Trying to manage both strategy and tactics can be a really frustrating experience.
Whenever we allow players who control specific units to have an advantage in combat, people complain that there is too much micromangement, and that the players who micromanage their armies more (pick individual targets, move wounded units out of combat, etc.) always win.
Consider if ambushing and changing formations had that big an effect on AOM's gameplay, you would still lose to the players with the fastest mouse control, but it might be even more frustrating because your large army could get beaten by a smaller one that was more tightly managed.
I just think they are two different types of games, and blending them doesn't work so well.