The RAW images are much larger and take more time to read out. This drops the frame rate from 1 image every 2.5 to 1 image every 5 seconds. The loss in quality from RAW to JPG is not worth the loss in coverage ability and additional upload and storage required.
The flight planner file is not for use with the Phantom 3. It is mainly intended for use with the DJI Datalink or open source hardware.
Also, we are not aware of any photogrammetric software that will process RAW or DNG files.