In 3.5, there was a specific prohibition against using power attack with light weapons, but in pathfinder, that prohibition is not in the text of the feat. Is the prohibition against using power attack with light weapons simply in a different section of the rules now, or has pathfinder removed that prohibition, or is it generally accepted that RAI is that light weapons can't be used with power attacks and it simply has not made it into an errata yet?
you can PA with light weapons fine. you just can't use them 2h to get the bigger bonus.
I don't see why you can't use power attack with a light weapon, add force and velocity to object and it gets more powerful.
Ok, well here is a silly question then: does double-slice affect the off-hand penalty on damage for power attack? It seems to me that RAW and RAI is that the two feats do not affect each other, but if I'm wrong, I'd like to know.
Should but doesn't. It is the same issue with a Monk using Flurry with a two-handed weapon for 1.5 x Power Attack. Without some sort of language directly linking strength multiplier and Power Attack damage in the general case, there isn't much reason to argue otherwise.
Well, other than "That is silly. Everybody cool with a house rule? Great. Moving on..."
Not really too concerned with should or shouldn't here. Double Slice and Power Attack are both good feats. If they can be combined, cool. If they can not be combined, they are both worth taking anyway.
Yeah, we have that exact houserule with the group I'm in as well. "Hey, can taking Double Slice let me add full Strength to my offhand attack with Power Attack?" "Sure. Now where's the pizza?"
Also, if you check the Pathfinder softcovers, there's a Power Attack-esque feat called Piranha Strike that is specifically for Power Attacking with light weapons and Dexterity.