With the Camera2 API comes the ability to save a raw file containing sensor information. I cannot find any FOSS programs that currently do this except for this demo, which lacks any sort of manual settings - I cannot even turn flash on or off, and there is nothing in the way of changing focus settings either.

https://github.com/googlesamples/android-Camera2Raw

So I'd like to ask for RAW file saving capability when you have the experimental Camera2 API support enabled. I am no java or android programmer (I can write Java but dislike doing so), but from what little I know about it, I'd think that this would be a reasonably easy feature to add:

http://developer.android.com/reference/android/hardware/camera2/DngCreator.html

http://developer.android.com/reference/android/graphics/ImageFormat.html#RAW_SENSOR