I haven't read the entire thread (and didnt really feel the need to), but I'l just put in my $.02.
---------------
Live is natural. Snakes have been attacking and killing live prey for thousands, if not millions of years. Getting a scratch or a bite every once in a while isn't going to kill them. Heck, I cuaght a huge ratsnake several weeks ago, and this big fella had more than a few scars on him....they all looked very well healed....even without someone putting neosporin on it!!!
However, I do feel there's right ways and wrong ways to go about it. Yes, if you leave your snake in a box overnight unsupervised with a rodent, yeah, it probably will get ravaged. But many snakes will take live prey readily, and the rodent is rarely alive for more than 10 mins. And there are other factors to consider before attempting live prey; is the snake's habitat set-up properly, are the temps ideal, are you feeding inside or outside the cage, is the snake even hungry, is it about to shed, etc etc??? Believe it or not, not every snake wants to eat weekly and nor should they.
In general, I prefer live over pre-killed or frozen/thawed. My BP eats live and in the 15+ yrs Ive owned him, I can only recall 2 instances where he got tagged and both occasions were where he had wrapped around the rat in a particular way that allowed it to knaw on him while he constricted it. Nowadays, I have two general rules when I feed live; A.) I ALWAYS supervise the feeding, and B.) if the snake hasn't shown interest in 10 mins, the rat comes out.
Also bear in mind that many professional snake breeders (i.e. guys that actually do this for a living and have done so for over a decade) continue to feed their animals live prey. These are people who have hundreds if not thousands of snakes in their facilities. They feed once a week, so do the math; they all say they hardy ever (if at all) have ever encountered a rodent attacking a snake. Don't believe me, call/email them yourself and ask; Brian Barczck from BHB, Ralph Davis, Bob Clark, Tom Burke, Robert Applegate, Tracy Barker, etc etc. This tells me that its not a matter of the rat being aggressive or whatever. Its a matter of improper feeding methods and not keeping the animals properly to where they are wanting to eat. The bottom line is that if the snake is healthy and hungry, and you feed them properly, live prey is not an issue.
Having said all that, I will say that I currently feed F/T prey to most of my collection. The only reason is that it is cheaper to order them online as opposed to buying live prey every week at the LPS.