But dont weapons with double types (like Kopesh which is a Heavy Blade and an Axe) allow the bonus to stack? I mean you take Weapon Expertise once for Heavy Blades and one for Axe and now you have 2/4/6 bonus to damage when wielding a Kopehs right? same thing for a Fullspear or any weapon with two weapon groups right?I do not really see any room for stacking with itself left in that. The special line makes that quite clear.
On topic: I like the PHB 2, one of my players is already building a Goliath Earth Strength Warden, god the idea of that beast running around with a mordenkrad is scary, Goliath Greatweapon Prowess bonus to damage is to two handed weapons in general right? or is it limited to just the two handed weapons you gain proficiency through the feat?