Yep, and the Battlesmith's class feature also gets wacky when it differentiates between Weapon and Implement attacks.
I don't have it in front of me, but IIRC they have a class feature which gives Brutal 1 (or expands the Brutal range by 1) any time they give a bonus to a weapon attack.
(er, I mean Paragon Path feature...)
-O
Hah! OK. Yeah, like I said, I have neither the book nor the character in front of me.Okay, -that- is a little bit more sense-making.
That'd be Battle Engineer.
And yes, it only works on bonuses to damage when applied to weapon powers.