1) Fiction...there is absolutely no reason to move for feeding.

2) No matter what you feed him he will always consider your pets food. Feeding mice will not stunt growth, you will just always have a skinny, unhealthy, hungry animal. There are other options, almost all boas can be converted to FT. You can feed frozen rats or gennia pigs, but he will need larger food items as he grows. I personally believe he will get used to the smell of your rats in the room and will not be aggressive because of the smell...at the same time I also believe that will lessen his feeding response on feeding day. Then again we are talking about a boa. iMO, I would not keep my rats and snake in the same room.