I don't think 'personalities' are that hard to do, nor to switch during the game. In fact earlier in this thread I explained one way to approch it with the externalized AI parameters (MoO3 did this, and it actually worked, though MoO3 had other problems...)
The scripting of the personalities isn't even that difficult if you don't try to get too fancy with it. The personalities are basicly templates that provide the AI with %s of resources to spend on commanders, army and magic. Within those two broad catagories there are several subcatagories. For army its balance of light troops, medium troops, heavy troops, and summons of those classes (you can break out archers and support as well), for magic its what schools to research (for particualr spells) based on your existing ability to use the schools, and how much do devote to research v. summoning (tied to army) v. other spell (direct damage, search, overland...), for commanders its what ratio of Mages to priests to assasins/scouts to infantry/cavalry leaders...
There are alot of matricies to be made, and there are alot of values to add in, and there are even alot of interdependancies between the matricies, but once you've mapped that out, the actually application is easy. Then its up to the devs and players to tweek and mod to find what values work best for what races.
Kris has mentioned (elsewhere) that he thinks its an interesting idea, but he's not sure how much of it can be easilly done given the existing Dom2 code. I know they are taking this seriously, but it is a very tricky thing to do, especially since the Dom2 code wasn't first written with this in mind. Anyway, keep up the suggestions, and try to be more specific then general, there's been enough generalities over the Last few weeks to kill a horse
