The main differences are:

• It supports a Jump button
• It renders the Joystick (pad and button)

This implementation is not yet committed in the cocos2d repository since it has some hardcoded values, and is focused on games that uses stick + button. The cococs2d’s version is focused on dual stick games.

In case you are interested in it, you can download it from here: joystick-20100122.tar