That's why I said I hoped it would appear as a Theme. As a theme, it's about right-- it's a couple of feats, that just about any character ought to be able to have, that defines a key part of how your character does what he or she does.
Seems a pretty solid Theme idea to me, you can see how you could build it with feats and it looks the kind of thing you could want with any class. It would be nice if you could somehow flavour the theme* so you could take blades of fire for a pyromancer, blades of Shadow for nightblade or blades of psi-energy for your Gith knife thrower.
*I almost typed theme the theme, but that way lies madness!