From the Modding Framework site
BWallace said:
Improved AI - enemies more likely to switch targets instead of circling looking for a way to reach current target
Break off engagements when having trouble reaching the target before selecting a new target
The first bit means he's updated the frequency of the target re-acquistion loop while moving, which I asked Obsidian to do in the beta via bug report.
Second bit I'm not sure what that does exactly.
This guy is p. good - made it easy to port the mod to new versions (automatic instead of Bester's 6 hour+ manual fixing) and adding new features
bman654 (BWallace) said:
FYI I just uploaded IEMod 1.11 where I've attempted to improve this. The AI is more proactive about switching to a different target when it is having trouble reaching its current target. There are still times when an enemy will just inexplicably stand there doing nothing--I've not yet tracked down the cause of that. But it does seem to play less ring-around-the-rosey now.
I PMed him about the units standing still, as I'm 99% sure I know the cause of that issue, should be an easy fix.