There are so many great and interesting things combined in this game, but one has to play it to discover them himself!
I would also like to point some things out similar to your wishlist:
1. You are right about the zoom option - it is especially needed when you start owning a lot of land
2. The "political view" might be touched a bit because with a lot of fights, it gets messy 🙂
3. I think changing knights' skills at the cost of books can also be added, so we can have an extra use of the oversupply of books in the "late game".
4. A super easy setting can be added where knights dont age and die (they remain permanent but at the same time releasable/inprisonable etc.).