Mixes can be used to make the plane fly perfect, but I don´t think they are usefull to do maneuvers... think this way: do it takes the same amount of inputs to do a snap flying at low speed that high speed? what if (as many 3d setups) I have an enourmus amount of rudder? (it will look like a barrel more than a snap) a % of what do I use.. high rates or low rates? how many degrees are high rate?
So, what I´m trying to say is; there are other variables that a mix can´t manage better than your thumbs