Huen 说:
If you look at the MageLord's tweaks list http://forums.taleworlds.com/index.php?PHPSESSID=ac1ece70fb63d000dff97cbf99e8500e&topic=46290.0 under 'combat/troop related', he has created a tweak which lets you access your inventory during sieges.
Just open your inventory and remove an item from your arms slots by placing it in your inventory. Then pick up an item off the battle field it should just go into the empty slot. I always do this when i need extra arrows or a new shield during a battle.
Would this also be a loophole to gather more loot without having to share with your men?
You could pick up a weapon or a horse, put it in your inventory and go look for more dropped weaponary or horses.
Or would you lose it after the battle?
Even if you see this as cheesy, you could still use this trick to pick up a lords weapon for more than the remainder of the battle which wouldn't be cheating in my opinion.