Hi! Thanks for you interest! In answer to your questions.
2) Do you have plans to continue development and support for this module?
Yes, we have more planned features and also intend to fix any bugs or issues found asap.
1) Difficult to quantify this. I would say most, if not all, of Box2ds features are exposed, but not every single function is. I tried to expose enough to allow you to make whatever game you want.
The best way to answer this question would be if you listed the functionality you need and I can say whether its there or not.