This helps for the responsiveness
http://www.fallout3nexus.com/downloads/file.php?id=11750
That doesn't work very well. I tried it and I ended up having Raiders that just stood there while I blasted away at them. Unless there's been an update since I used it, it causes a major AI bug.
PS; I just noticed that it's had a couple of updates since then so I guess I should give it another try. It is rather silly behaviour when your sniping. It makes things far too easy being able to pick one off at a time. I always clear the entire courtyard of Evergreen Mills that way, just go up into the hills around it and start killing them one by one.