Well for Deadly Reflex, I was under the impression that the numerous attack keys were just scripted to perform variations of a normal attack (adding a knockdown effect, etc.) As for dual weapons, while you will definitely need to make a new animation, pose, model, etc. to show the double weapons. However, I wonder if you can't just edit the firing animation to look like the muzzle flashes on both weapons? That way, you could make the dual weapons into one equippable one, and make the gun fire two shots at a time (which I know can be done, it's in the vanilla game), giving the appearance of both having dual weapons and using both. Although, it might look weird to fire both at the same time, but this is just a theory I'm putting out there. I have no experience modding, so if I'm way off...you get the idea. :)