I've tweaked the AI as much as my modding skills allow, which is limited to tweaking game settings that mostly adjust things like distance and timing. That may not sound like much, but I've gotten pretty good at it . . . my tweaks completely changes combat game play. Anyone can use FO3Edit and tweak most of these settings . . . that's the easy part. The trick is doing so in a way that is balanced, and that doesn't break the game. Many of the settings are interconnected . . . often in ways that make no logical sense at all; so changing one little setting can have major consequences somewhere else. Detection is one of the most difficult things to tweak . . . if a value is a bit too high, no one notices your gunshot . . . but if you lower the value just a touch, EVERYONE comes running. I really don't think that I can improve this much more.
After spending untold hours doing this, I've become somewhat skilled at it . . . but I am not a computer programer by any stretch, so I do not have the ability to completely reprogram the AI, which is what the game really needs.
I think you made great improvements with the AI, the thing that realy lacked in vanilla for fallout3. Another thing that would enhance the replay value of the game, would be new dialogs! The npc's that would be in city to whom you could talk about everything, and even it dont need to be related to quests. Just a good dialog options, the second thing that lacks in Fallout 3 to this very present day...