Good input. Thank you. I see what you mean.But...
I don't think Blender would be needed - from what I see the sound is linked and set up to the kfs in nifskope. I actually saw the info mentioned in FFvt3R character tool when running an animation. So I think it would mean you would need more knowledge of nifskope.
I don't see the size of the keyframes really changing, as it looks more like a link to a sound file in a separate location.
Also, would this work.... If you took the Superman kfs in nifskope, and copied and pasted the head node attack and renamed it to head 2 or whatever, then you could have 2 separate attacks.
As for where you put it in the animation, I think you would have to pick a frame and link it there.
I'm not sure how the sounds for fx works, but if you have that ithis could be limited to animations that don't have an fx.
Thanks for the input... not sure if this could even be done in FF, but as you said, this game is so customizable, and there's something for everyone.
RD