Not yet, but odds are someone will make one now Seriously though, there isn't and if I can manage to do it, I will upload it for you to see/use. You want the characters to get knocked away farther as damage increases right?
just store there dmg % as a value and multiply there knockback ratio by a certain % of that value. its simple really, if you mean making the characters knock back thats a diff story, then youd have to program some wierd physics thing
Sorry, but do you mean the ratio as in literally the amount of damage to knockback, or how to use it? If you need to know the number of the ratio, then I can't help you there (I don't play Smash Bros. much, and don't own the Gamecube/Wii versions.)