cds13, now that you mention it, I do recall the enemies bashing door if they can hear your behind them. Still a good thing, IMO. And, you can turn that in your favor, as well. Putting a trap (or several) on a door before they notice you can cause them to trigger the traps when you open the door to get to you.
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Another nice improvement of Tony K's AI is that creatures try to use their skills. You mentioned taunting, and many creatures with stealth skills will try to be stealthy when they sense danger. That adds a little flavor instead of the stealthy mobs always standing around in broad daylight instead of trying to sneak up on their targets.
I agree that the auto-hasting option is too much. It's easy to turn off, though. I think there were one or two other options that I leave off as well, though I don't recall them now.
brendonwp, one of the things that makes the final level tough (especially so for spellcasters) is that that it is fairly small. Not only does that complicate ranged kiting tactics, but it means that the mobs may wander so close to the entrance that you can't rest there. Once, I had a caster who pretty much exhausted himself with the undead in the two outer rooms and needed to rest before taking on Desther and the others in the main room. Luckily, I had a minor summons and an invisibility potion left. So, I snuck into the main room invisibly. Then walked to the far corner and called the summons and put him in "hold your ground" mode. When Desther & Co rushed him, I (still invisible) rushed back out and rested.