Live feeding should be avoided, I'd rather force feed then feed live. I've seen snakes eat their prey live, with out constricting first (fortunately it was a pinky).
Even supervised live feeding can result in death, a single bite can cause an infection that can kill a snake. A rat can chew through concrete, imagine what it can do to your snakes spine.
How long does it take for a rat to bite? how long would you take to interfere between the rat and your snake?
I know I'm not going to change anyone's mind that is sure live feeding is fine. but hopefully some one is persuaded by this posting.