Personally... I'm against that. It's just not in the spirit of IVAN. Although perhaps there should be some more neutral creatures, ignoring you unless you hang around for too long, and maybe monster infighting - kamikaze dwarves blowing up zombies, goblins fighting hedgehogs, etc.
(easy to do in theory, I guess, just split monsters into teams, eg. "undead", "neutrals", "demons", "animals" etc - the downside would be that the monster behaviour as it is will cause most enemies to kill each other before you have a chance to see them)
But I think the most useful thing would be fixing the AI of pets and friendly characters - that'd just make them more useful.
Ps. I've just downloaded Incursion and - wow. Complex. An RPG where you create character for several minutes, more than how long you can usually survive