Tony K has developed a great add-on to Neverwinter Nights which improves the AI of the game. In its default setting, the new AI will make your henchmen (the computer-controlled people who fight with you) much smarter. There are many additional options in this add-on including making the monsters you encounter smarter.
Here’s what Tony K himself says about the Henchman Inventory and Battle AI:
This highly configurable modification of NWN improves the intelligence of friends and foes, both inside and outside battle. Since its original release in July 2002, it has been tested by hundreds of people in the BioWare community. The mod works with or without the expansions. You can use it to play the Official, SoU, and HotU campaigns, as well as compatible fan-made modules. Prominent features are: 1) Improved battle tactics for all NPCs, especially with regard to weapon switching and spell casting; 2) Random roaming capability for monsters in the module; 3) Access to the inventory of familiars and animal companions; 4) Improved yet still legal feats and spell selection for the six standard OC henchmen; 5) More useful behavior (buffing, item-gathering) for henchmen outside battle. Most features can be turned on or off during installation.
New for v1.02: Use improved compression in Inno Setup to decrease exe install size under 1 MB. Associate challege rating adjust better to high levels. Fix out of ammo problem with henchmen. Improved omnivore and herbivore code for fleeing. Add support for Sea Hag. Cowardly flag is better supported for NPCs. New option allows for associates not to go into stealth when the PC does. Search mode options removed since associates already go into stealth when PC does. Most spell script overrides have been removed. Check readme for details.