I have to say I love the idea of this system and if it ever get's finished I would love to see this turned into a pdf.

I'm not sure how much help I'll be but...

In regard to Two Weapon Fighting line.. The only classes that really benefit from using two weapons is classes with extra damage dice such as Rogues. I could see the point of lowering the cost since most people who take it won't gain the full benefit from the feat. Sure a fighter or even a wizard (yes I've seen this happen) may take the feat but their damage output won't be high enough to really justify taking the feat at to high a cost. Although I'm not complaining on where it's at but I could see it being lowered since really in core only one class gets the full benefit from it (ranger get's it for free but no extra damage dice :( ... beyond favored enemy which is highly highly situational)