For the one snake I do have that eats live, I do not dangle the rat (I wouldn't recommend it for mice, either) because I don't want my snake striking at a freaked out rat. I just drop the rat in the tub, and 9 times out of 10, the rat is relaxed and grooming its self or exploring the tub when my snake strikes. A much better situation in my opinion.
Oh, and that 10th time I have yet to account for? That happens when I drop the rat in the tub and it imediatley crawls into the hide currently occupied by my snake? That never goes well for the rat...