I wouldn't recommend what you are doing. Usually when you trying to control 2 items from the same channel its not something you always need to use (such as steering). If you had a 3 channel you could have throttle, steering, and then split the 3rd to do lights/winch (usually its setup on a 6 step system like you guessed already).

Check out the GT3C from hobbypartz as a cheap upgrade (~$50)