I threw this up on Reddit as well.
The feat Dorn Dergar Master lets you use the dorn dergar as a one handed weapon.
The fighter's advanced weapon training let's you treat a one handed weapon as a light weapon for two weapon fighting penalties.
Would these stack to swing double dorn dergars at -2/-2?
Can they also be modified with Dual Balanced from adventurers armory 2 to bring that down to -1/-1?