Can you be more specific about the problem your met on iOS 7? I just tested with our test case, there is no problem. Or you can give us some test code, and we really appreciate feedbacks for bugs.
As for the API changes, I totally understand that you are not happy with that much changes, and we know that is not easy to upgrade from 2.x to 3.0a, that's why we created many docs to explain the reason and how to upgrade. Maybe that's not enough, but we will continue to provide more guides and informations to make things easier.
Here is the upgrade guide with links of other documents in it: http://www.cocos2d-x.org/docs/manual/framework/html5/release-notes/v3.0a/upgrade-guide/en
Let's write less and play more !