I'd like a feature to set the PCs to be controlled by AI in combat -- the hardest AI difficulty in the game. Also an option to only possess one or two monsters during combat, while the rest remain controlled by the AI.
Can I ask you in which case this could be useful ?
Yes, you may. Go ahead and ask.
Wow. In what case PC controlled by AI is useful?
There are many different story applications it would be useful in. For example, perhaps the player or players are possessed by a malevolent entity forcing them to fight and kill guards, etc.
Another way would be if the player was infected with lycanthropy... or under mind control.
GMAddon1: Adds almost every single monster and NPC from the main campaign into GM mode, plus a few large custom maps to use in GM mode.