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So far my behavioral selection has been to eat the human-aggressive birds. The flighty line is new here and I haven't selected against flightiness yet. I introduced that line here because I need the body type. I don't want overly mellow birds. I want them alert and predator savvy, wary but calm around humans. Not hitting the wire every time I walk into the pen. Eventually I will select for non-flighty. For now the priority is body type.
Not sure I have enough experience to answer the fertility question. I've only been doing this for a few years. In my flock fertility problems can happen with aggressive birds as well as overly mellow ones. This year I have a good-looking cockerel I was trying to get chicks from because I want to know if he is carrying an undesirable recessive trait. Problem is he's an aggressive jerk and the hens don't like him. Eggs from his pen have had low fertility and I haven't gotten enough chicks from him to answer the recessive trait question. He is headed for the stew pot unless he learns some manners soon.