Are monsters boring you? Game not challenging enough? If only there was some kind of mod that added different AI patterns to mobs to do just that... Oh wait, there is: Special AI!
Special AI adds a variety of new AI patterns to mobs, including: monsters idly breaking your light sources and certain blocks, an attack AI for "passive" mobs, mounting AI, and a pile of unique combat AIs to keep you on your toes!
Each AI added by this mod can be disabled and configured, while most can even be enabled/disabled per mob, including for mobs from other mods! The properties file is generated in the 'config' folder in your .minecraft directory.