Here is a set of values that can be used for AI leaderheads.
The file has the AI parameters for vanilla, for Planetfall, for Dunewars, and then by faction for Warhammer.
I don't know enough about the different leaders to vary them within a faction, so there is just one set per faction for now.
And we have a total of 28 (!!!) factions, which is kinda insane when you think about it.
We'll need to fill a few more fields in later, and playtest a lot, but this should still provide some significant faction variation (hobgobs as unscrupulous backstabbing mercenaries, goblins as cowardly minions, bretonnia as noble and honorable, etc.)
What David did for Dunewars is write a script that would read the details into the Leader files.
Hopefully you can somehow do something similar, otherwise it is a *lot* of data to read in manually.
[You'll also need I guess to copy the things for each civ leader; so there will be 3 identical Empire lines, one for each leader.]