I'm evaluating FPV and I was impressed by its semplicity and speed.
I think is a good idea to keep it simple and not introduce editing feature. Anyway I think it would be very useful to have a lossless JPEG rotation feature for people missing the EXIF orientation tag from the camera.
I know FPV is targeting pro users who shot in RAW format using pro cameras but users like me needs to make a preliminary pass with something like irfanview to rotate pictures. Maybe I'm not alone...