Official comment
It shouldn't have been taking images that fast and if it was doing it for very long it would likely have started to fail. We follow DJI's guideline of 1 image per 2 seconds on most of their cameras.
If you are pretty sure it was actually taking images that fast we would appreciate you sending us a log file from that flight so we can check it out.
DJI has not plans that we are aware of to extend the number of waypoints. Terrain Awareness in rugged terrain is the only time we ever see people using that total up.