In one of my latest session 2 of the PC of my players have been possessed by a Ghost. I didn't control them directly. I told them what to do and it felt like there was an internal conflict in the PC. It has been super cool. They had to roll for damage but they weren't in control of their body.
In few words, you want AI controlled players just cause they are bad at roleplaying? Well, this is something that can't be fixed with an automatic systems.