Cocos2d is and excellent framework. It has saved me tons of time during my game projects. It offers almost everything I need. However, sometimes there are some features that are not supported by cocos2d.
This is the case of rotating a sprite around an arbitrary point. Rotation in cocos2d is based on the concept of anchor point. This is ok on the 99% of situations, probably. However, during the development of Muster my Monsters I need to perform rotations around arbitrary points. The idea is to have an sprite “orbiting” around another sprite or some defined point in the space.