I just stumbled across this Warband add-on, don't know if it's possible to hook it in or if it's been suggested (didn't see it when I searched) but it can be found listed under:
The Caravanserai - Released Warband Mods > Warband Mod List (updated 29.11.10) > Singleplayer Mods > Pre-Battle Orders & Deployment or
http://forums.taleworlds.com/index.php/topic,142816.0.html
It's a pre-battle feature 'Mini-Mod' that ...
When planning your battle with the enemy, a presentation similar to the "heads-up" battle menu appears, allowing you to customize 4 orders to each of your divisions: an Initial Order (charge, hold, follow), two movement orders (Move Forward/Back 10 paces, Stand Closer, Spread Out, Mount and Dismount) and a weapon use order (chosen from the Native weapon use orders Fire At Will, Hold Fire, Any Weapon, Blunt Weapons). Movement orders can be repeated up to 4 times. Across the bottom are options to Reassess--return to the encounter menu; Scrap all--clear all orders; Prepare Orders--preview the order set up on the right panel; and Dispatch Orders--store the orders and return to the encounter menu.