If you do not launch the official version?
What hope and a basic combat system we are following priorities
1 - Use shields
2 - Horseback Fights
3 - Arc System improved, for more trouble
4 - Axes and Spears
5 - Longsword
1 - People spread rumors
2 - react to what you see, for example, if they saw him breaking into a place.
Ability to fight more than one opponent at a time.
Now what I expect of a mod that I know they have not released the official version, given your goals. In matters:
1 - Ability to better manage their own house
2 - Create a business
3 - Having a family
4 - Winning titles for services and relationships, and can even become a vassal of a noble
5 - complex economy, with buying and selling of resources to distant cities
6 - Politics, war between kingdoms, not something that follows the chronology of the story, and army attacks or bandits anytime.
7 - Guild of Thieves
8 - More goods, items and means of production
9 - cars for transporting goods between city
10 - Improving the system of need for food or rest, to be real.
11 - The character felt cold and need to seek shelter or build a campfire
12 - People observe fires distance and can respond to such acts and spread rumors.
Well, I'm not exactly original or wanting something to change the whole story. But things could be added to the medieval environment without escape the limits of the work itself.
Things that developers might not have working due to schedule is tight and that could bring more reality to the world being created. Specially regarding to making sociadade as realistic as possible, with the closest to the actual AI.
So I hope a mod, you can play along the original or other mods, with no mismatch.