I try to do the hover thing if I can to avoid getting off the saddle too. The key thing to remember though is to still get one foot unclipped in case you do need to stop altogether. And I agree with the right/left question being up to the rider. I cannot unclip on the right and put that foot down. It just doesn't work. It may be because I'm left-handed; I don't know. But do what feels the best, not what someone says you should or should not be doing. After all, it's your hide you're trying to keep off the pavement!