I always keep my bike in first gear while sitting at a red light. Its for your own safety as you may need to move very quickly if someone tries to back up and run over you. I often see the young inexperienced bikers drive right up close to a cars rear end, and immediately shift into neutral. Both bad things to do. If you are tight up against a vehicles rear end, they may not see you and you have no time margin to move if they back up.