@NRABrazil - Great. Some answers to your questions below:
1. Add To Media Cache - This has different use cases then the APPCACHE file. When you build your app or game as a hybrid app and sell it in an app store, the Add To Media Cache will let you retrieve and store a remote file locally. So say your app/game wanted to pull in new content via some sort of data, game logic, sound, video or image file. This is the call you would use.
2. Camera - Correct, the camera api allows you to take pictures using the devices (phone, ipod, ipad, etc..) camera. I just added that to the plugin today. I just need to add the a couple other camera calls and then will push the updated plugin to github. If not tomorrow, then definitely Wednesday.
I hope those answered your questions.