Indeed, but we also would need better control of our troops.
Putting your archers to the side to shoot at reinforcements and then having them friendly firing at your troops because the AI decided it wanted to shoot at the melee would be very frustrating.
We could trick it like Lordgood did. Basically inside the model you'd hide the fire. And using two bones to stretch it you could do something yeah. For now though, it does nothing.
I think it was heavy sarcasm.