Climbing npcs would fix virtually every "stuck" issue. I hope you can climb in Skyrim.
Amen! Climbing player and climbing npcs would be a great improvement for the gameplay. I also hope they will know how to use the environment to help them in fight (hide behind objects, jump on a horse and flee,...).
Although I kinda enjoy exploiting the poor AI pathfinding for example luring a powerful beast near the stables and jumping over the fence repeatedly while the beast and all the nearby npcs will keep running between the stables gate and the spot where I jump, that was terribly fun with so many arrows in my quiver...but it would have been damn exciting to see the beast smash the fence or simply jump over it.