@Cliff, @Michael
About saving flight plans and duplicate flights, you can follow this thread that is dedicated to these features that could be available by the end of August: (iOS) Saving planned mission.
I reported your need for desktop planning. This is something also part of our current pipeline.
Thank you for all the details you provided regarding the.kml / .kmz import on iOS. The most important need seems indeed related to remote and recently updated areas and to accurate flight boundaries defined with geographical coordinates.
The polygon flight will come later an Android, please follow the main thread for more information: (Android) Polygonal mission.
Regarding the white balance option, you simply change the option in DJI GO (4) as it will be applied when flying with Pix4Dcapture. In the future, we are considering integration more camera settings directly in our app to simplify the procedure.