I would gladly settle for a "fire two turns hold three turns then fire again" command. Or "Fire and Hold" for short.
The minor problem that I want to overcome is archers shooting into my own ranks. Fire and Flee does solve this but is annoying since the units will scatter to the four winds if they can. I want the archers to remain in the same province as the other units, regardless of battle outcome. A three turn break would be enough. If the enemy is still slugging it out with the infantery by then, friendly fire be damned, I really do need all the damage I can inflict.
I understand why Illwinter want to make a difference between commander and unit tactical training but I would be really happy if I could give any regiment the same range of Hold, Fire and Attack orders as a commander. Since a commander can only be given specific instructions for the first five rounds this would solve the problem with units glaring at eachother across the battlefield. After five turns the AI takes over and they attack eacother.