I also noticed that the Minor player gets all the first level starting techs. Now is this really balanced compensation for not having traits or UU's? I think I'm going to tone that down a bit.
In my own mod I not only added the aggressive trait, but a new UU to replace the warrior. It's a really simple mod. I didn't even make a new skin. I just made a new warrior type called Barbarian Raider and added 25% to city attack. That's pretty much it. I didn't want them to be overpowered or anything, but I wanted my one or two little barbarians to have a fighting chance when trying to take an early city since, playing as Barbarians, I'm not letting them build settlers.
Also, Undertaker798, what did you notice was so annoying about playing against Sid? I noticed a lot of diplomacy modifiers in the CIV4LeaderHeadInfos.xml that were either set to 0 or left out, when they're modified for all the other civs. I'd like a better idea of how the AI behaves before fiddling around with them. Maybe I could just take the stuff from one of the more aggressive Civs and paste it in.