Hey, guys, seems you are so 
there. Sorry for the inconvenience brought.
On the documentation, you can find that there are two commands for capturing different type of pic.
Sorry to tell you that the module does not support the RAW data output. Maybe in the future we will provide one with that function.
For the datasheet of Serial Camera all we have is what you see now. We translated it from the Chinese version, and add an Arduino demo code. If that is not enough for you guys, please tell us where should we improve.
All the best,
Steve