They're made to eat the whole prey, I'm sure snakes have evolved to deal with any problems claws and tails might pose at this point.
One of the reasons snakes don't suffer from the nutritional deficiencies that many other captive reptiles species do is because they eat whole prey, which ensures they get all the nutrition they need. Moreover, I have never heard of any instance of claws or tails causing any sort of problem for snakes, except if the prey was live, but of course it would be barbaric to clip the toes or teeth of live rodents!
The only instance I've heard of people removing parts of prey is clipping off the tips of the beaks of F/T chicks for young snakes.
While I guess that clipping claws and the tail wouldn't do any serious harm in the long run for a well fed pet snake, I just don't think there is anything to be gained from it. Besides, I think my voracious juvenile BP would not want to lose any part of his meals no matter how small lol