Why in the world would any Falcon taunt while in range for a grab, first of all?
By exporting the falcon gfx, shortening the animation timer, reimporting it as a new gfx, and finally coding it to replace the old gfx but only when the variable is called would make it possible yes. It would be extremely annoying though...
I thought the official term for the Fast Falcon Punch was just "PAWNCH!".You take away the falcon, and it's no longer a falcon punch. It's just a punch. You literally just suggested they neuter captain falcon.