I'd like stackable loot, like if you had the same of an item instead of it taking multiple slots, it would just go into its own pile!
All the horses that can be seen living in the battle can be taken.(stackable and if khergit or cavalry related culture send to a horse camp in game, that's interact-able!)
Horses don't take up inventory space!
Choose equipment before every battle.
Choose troops before battle.
The war horses are bigger than the others and customization.
Hunting in some way! (Possibly Falconry and Fishing)
Give quests to companions such as buying things or completing your quests you got from a lord!
Better NPC dialogue!
Custom Banners!
You can marry someone from another factions for diplomatic reasons/more courtiers/marriage options/families!!!
Better spear/pike against cavalry and a pike formation (You should be able just to hold all of your pikes and let the enemy charge in with cavalry)
Ships and Naval combat!
Way more options for RPG startup options!
Jousting/Tournaments, Carnivals, Feasts!!!
leadership voting!
trade fiefs!