If you're snake's the really timid type who bunkers down in her hide all the time, sure feed her in the cage, since she's not going to see you open the cage anyway and she might feed more willingly. What I do is just put the pinkie in front of her favorite hide and she usually smells it and peeks out and nabs it. Plus if you're going to handle her, she knows the hide goes up, and she gets ready to be handled, so she associates the hide going up with being handled (hopefully this changes as she get's older). For the more "social" types, I feed outside in a rubbermaid, and I place the mouse inside the rubbermaid and wash my hands before I get the snake out. Pretty much prevents all feeding type bites.
-13mur 6