Question in regards to Power Attacking with TWF. I see two possible readings of how this feat works with two-weapon fighting...
Prerequisites: Str 13, base attack bonus +1.
Benefit: You can choose to take a –1 penalty on all melee attack rolls and combat maneuver checks to gain a +2 bonus on all melee damage rolls. This bonus to damage is increased by half (+50%) if you are making an attack with a two-handed weapon, a one handed weapon using two hands, or a primary natural weapon that adds 1-1/2 times your Strength modifier on damage rolls. This bonus to damage is halved (–50%) if you are making an attack with an off-hand weapon or secondary natural weapon. When your base attack bonus reaches +4, and every 4 points thereafter, the penalty increases by –1 and the bonus to damage increases by +2. You must choose to use this feat before making an attack roll, and its effects last until your next turn. The bonus damage does not apply to touch attacks or effects that do not deal hit point damage.
(This one is my interpretation on how this feat works.) You are declaring whether or not you PA at the start of your full attack. If you are making an attack with an off-hand then you only get the 50% bonus on all attacks made that round. (Since the feat doesnt clarify that the 50% only applies in the off-hand. It just states you only get 50% of the bonus if you are making an attack with the offhand).
This still gives the advantage to someone who is wielding a two-handed weapon or a one-hander in two hands, but that has always been the case with this feat.
Any input?