And now we're back full circle to the dismissibility of the power! Yup skydragonknight I believe I alluded to the Girallon's Blessing solution by bringing up the Naga Item (since we don't always have a DMM-cleric in the party) and there are only so many feats/dips for incarnum bindings. But yes, extra support on those weapons never hurts.
In fact, if I recall a character can chose to wield a weapon 1 size up if he could have 2-handed a 1-handed weapon. With 2 or 3 of those extra arms sets we could get both the extra support to 2-hand both of the weapons AND have each weapon 1 or 2 sizes larger than normal, correct?
If so, adding Totemist2, some outside DMM help, and some cash could, on an unrelated note, use 2 sizes up (again doubling base damage) while still using two hands for the str and PA bonus.