Here are some of my humble opinions.
As for horse strafing, I don't think its going to be an active thing. I think it will be mouse operated, so you will have a certain window to swing left and right, but if you pass that limit, then the horse will stride into a strafe that's not quite 'a' or 'd', so it wont be as distinct. <- source = my head, pure speculation.
Dual wielding might be interesting, but make the dual wielder only be able to hit with both weapons while preforming overheads and stabs only, let it be slower but do more damage for example.
But on my list of what Bannerlord has to have is the following:
- Dynamic environments. I'd love to see wind, moving grass, water currents, rain and weather, (some moving clouds?), seasons, and better overall sounds. Immersion is important for me.
- More options in your fiefs. RPG's become more interesting with more strategy inserted in them, so I would love to see the ability to build more things that have more effects on fiefs as well as create buildings that say auto-recruit for you and then you go pick the troops up or something, or it puts them in the Garrison for example. Controlling taxes and caravans would also be very cool, for example you could instruct them to avoid certain routes on the map, or you could assign more/less guards to them and control their cargo if the fief is yours. A population for each fief would also be great, because it will give you an idea how much you can recruit, how much money you can make ...etc
- More micromanagement for your own army. It would be great to be able to split off say 5 Knights from your army and tell them to go scout an area, or be able to set up patrols around places like in some mods. Customizing your army more would also be cool. An 'upgrade' system of weaponry and armor can make your best troops even better for example. Imagine having 5 or 6 groups of Khergit Horse Archers patrolling around you in all directions giving you essentially extra view range. So you can see a larger area of the map which would be super helpful in invasions and defending key points.
- More options during siege. Things like sending people inside the castle, or maybe going inside yourself to try and open one of the gates (more entry points to castles please).
- Bunkering in. The ability to build a make shift camp that has a simple gate and fence to ward off enemies if you're stuck in enemy territory or want to safeguard a mountain pass or river.
- Idle building. The ability to set up watch towers or roads to help protecting the kingdom/sultanate..etc or speed up travel for everything on the road.