Roosters crow, mate and can sometimes be obnoxious. Some people have used no-crow collars with success, some have killed their roosters by trying to use them. Personally, if I can't let my rooster crow, I wouldn't have one. If your cockerel is in with the hens, he'll try to mate them. At a younger age, they're not necessarily polite about it. One thing to consider - if you live where roosters are not allowed, and try to keep this guy anyway, you could jeopardize the privilege of having chickens altogether. If people keep "bending" the local laws by keeping birds that aren't allowed, those laws allowing them could be revoked entirely.