Actuallly there is a way of neutering roos, it's called caponizing and if it were done, he would be called a capon instead of a rooster. I think it is mostly done at yound age for birds who are intended to be butchered to give them more time to fill out, with out getting hormones as they mature and making the meat tougher.
As far as silencing, I would imagine that would be possilbe too, but seriously, do you all really like him that much?
Edit: Black bird posted while I was typeing