Well, a faction can have only 1 faction leader in the same time. But you can add infinite family members:
You have to make something like this under the designated faction's entry:
Code:
character Rufus, named character, male, age 26, x 109, y 158
traits LoyaltyStarter 1 , NaturalMilitarySkill 1 , GoodCommander 1 , ReligionStarter 1
About brigands, I think setting higher value there will make less brigans. If 99 is not enough, put 999
edit: just spotted where is this thread... wrong place. Next time please post here modding stuff: http://www.twcenter.net/forums/forumdisplay.php?f=272