I have given the rooster temperament issues a lot of thought the last couple of years and have really been studying the behavior of the ones that I have raised. I used to handle them all a lot (males too) and still would if I had less birds and more time. I still kneel down beside their runs and pluck clover to throw into them and they love it. I understand the reasoning behind if you handle them a lot they don't fear you. I, for one, don't want mine to fear me, just respect me and I believe all of mine do. They even talk to me when I approach, hoping I brought them something. When I walk into a pen (8x5), I do what I need to do with their feed and water, gather the eggs, and then leave them alone. I never move quick and/or reach toward a hen. The male is there to protect them so I don't let him think I'm a threat. I'm calm and he's calm. I don't have to carry a stick and when I need to Frontline them, I pick him up and do him first, then put him in a different area until I'm finished with his girls.
The worst injury I've ever had from a rooster was from a male that was afraid of me and took a small chunk out of my arm when I picked him up. I would much rather have a calm confident male than a flighty unpredictable one.
From what I have observed, I believe aggression is somewhat genetic and follows certain lines. I had one hen that every male out of her was aggressive. I no longer have her. I don't think it's wise to keep and/or breed to aggressive males and/or a female that produces them. But if you did, I'd just watch to see if aggression follows. I view temperament as an important quality, just as I would all of their other features.
It's all a learning process and I still have a LONG ways to go. This is just "my opinion" on the rooster temperament subject.