The first time I had ever heard of Kingmaker was the computer game, and playing it is why I chose to run it for my group. Obviously, with the companion guide, some of the companions have been brought in. That has left me wondering what other parts of the CRPG might work better than what is printed in the book.
One of my first thoughts is how each of the arc villains gets fleshed out a bit more, like seeing a vision of the Stag Lord's past when you find his father's old hut or conversing with Vordakai through his familiar, or going into Nyrissa's dream. These are great opportunities to learn about the villains without the threat of missing them by rushing into combat.
So I'll pose the question to you all. What elements exclusive to the RPG would you adapt into your Kingmaker campaigns?