Well, first I'll point out that I was throwing that in to clarify a technical point. Doctor Proctor quoted the feat's entry, but it seemed as if one or more poster was still treating drawing with Quick Draw as a Free Action when it is not.
After that point, I'll now move to my interpretation of that clarified point, which is of course debateable.
I think it could imply a number of possible things:
1) You must draw "before" the attack actually occurs. I consider most actions to happen in snap-shots. For example, Twin Strike is two attacks, but still a single standard action. There is no "first" and "second" attack because that implies a sequence of attacks. They happen simultaneously. Likewise, attacks that have a "secondary" attack are still part of the same single standard action. You need to have a weapon drawn before you can attack with it, so all weapons must be drawn prior to all "attacks."
2) Alternatively, drawing in the middle of an action is still part of that action. It's not inserting a free action in the middle of things. In fact, it seems Quick Draw allows one to draw weapons at any point in an attack; for example, attack with a versatile weapon two-handed for one attack (switching grips is a free action, I believe), then quick draw for an off-hand weapon for a secondary attack.
3) As for "inserting" damage from item powers, I guess that does indeed imply that free actions like those can, indeed be inserted in the middle of an attack.