1. DP and Dark AI get along just fine. I used them both in my Dark Physics compo entry.
Every loop, I push the character controller toward the Dark AI position, the entire distance. Now, because of the physics, they won't always end up the same. You are supposed to reset the Dark AI position every loop with the new position of the character controller. There is a problem with this at the moment.
[Dark AI + Dark Physics] Interaction bug
The issue is that every time you reset the AI position, the AI action changes to 'Stopped'. They'll never attack because of this.
So, what I do is update the AI position only if the distance between the AI position and the character controller is greater than 60, which is the height of the model.
It's a work around, and is hopefully fixed soon, but it works great anyway.
2. For people to play a Dark Physics game, they need the drivers. You should probably package them in an installer for the average user, downloading additional drivers is usually too much trouble.
Come see the WIP!