PRD wrote:
Benefit(s): As a swift action while wielding a magic weapon with a weapon special ability that deals extra acid, cold, fire, electricity, sonic damage on a hit, you deal an additional 1d4 points of damage of the same type with each hit you make with that weapon for 1 round.
No because the damage types are discrete. So if you have a +1 Shocking Flaming Longsword, you can spend a swift action to boost its energy damage. Now, does the Longsword deal Electricity damage? Yes. So you've spent the swift action to boost its Electricity damage. Now, if it had listed them with and/or, that would be a different story. But, as it stands, you have to pick one element to boost. And that's pretty much in line in power. It would be rather unbalanced to have a +1 Shocking Flaming Freezing Corrosive Thundering weapon that gets an additional 5d4 damage of varying types just for a single feat and your swift action for the round.
