I don't think whether or not you feed live or f/t makes a difference in a snakes "aggression".
Ball Pythons are opportunistic feeders... So they will eat whenever they get the chance (most of the time).
So do you want to know whether the snake has a good feeding response or is aggressive? Because they are two totally different things.
I put "Live Fed, Aggressive" because when I feed my snakes they are very aggressive towards their food, rarely ever towards me though.
Also I notice more of an aggression issue with hatchlings versus adults. I've also noticed that people that have so many snakes that they can't give each snake individual attention tend to have more aggressive animals. I suppose they are like this because they don't get handled very often.
I personally don't feel that feeding either live or f/t depicts a snakes personality.