1 : None of the AI behavior is scripted
2 : The Dynamic Music is entirely in game until the final montage.
3 : It is still a work in progress.
Make sure to read the tutorial to Understand how this works!
Mod DB Page : http://www.moddb.com/mods/underhell
Website : http://underhell.wecreatestuff.com/
Steam Community Page : http://steamcommunity.com/groups/Underhell