IMHO this can work if:
1. We'll have permanent teams for full map. No rebalance after end of every round.
2. If you follow orders you receive bonus exp (gold), if you do not follow - you have exp penalty.
3. Commander must plane tactics for next round (so first round is standart mob versus mob, commander do not take part in first round but have some time to write orders, and point objectives)
4. Access to the map with simple enough order system for commander, where you can divide your team into parts (flangs, reserve, main part), and give orders to infantry\ranged\cavalry separately (as player you must clearly understand what part you belong and what your objective is) - so we need access to the map with commander's orders in battle.
It's hard to implement I know, but this can be a second breath for Battle\Strategus part of cRPG