As far as temperament, just wait. They are fairly docile now but that will change when they get mature. These are still wild/feral birds they just don't know it yet. Its in their nature to be flighty, that's how they've survived.
Feral chickens are almost always of game origins. American Game & Old English Game, maybe even some Junglefowl, Cubalaya, or Aseel in them in some cases.