[Pocus]

There is also a problem with how narrow is the deployment area on the battlefield. Against big sized armies (200+ units), you will always find that your cavalry that you put on a wing, with order to attack rear, will fail to do anything 'flanking'-wise, and will stumble against the enemy center (which is a big mass), as soon as they move.

With a wider deployment area, and with a revision to the attack rear, then you would have proper usage for wings of cavalry.

Revision of attack rear:
It has been aknowledged by the devs that the bigger the formations are, in the front of your army, the lower the chances are that an enemy squad on attack rear will really attack rear. I'm unsure its realistic, but gameplay wise I can tell you that against any significant sized army, this 'magnet' effect is so strong that any attack rear order will fail miserably.

damn, I feel my english is worsening each days. Sorry...