I'm not understanding the question. Chickens are chickens. Breeds are something people have created. A rooster doesn't 'see' breed, all he sees is mature hens. All breeds are still, genetically, chickens.
1. Yes, you can have one rooster and several different breeds of hens. Roosters don't see 'breed', all they really care about is if it's female. You don't really need a rooster, unless you want fertile eggs to hatch.
2. Yes, that would be free-ranging.
3. Everyone here has their own...