it would be great if in the future there was the possibility to record the external mic on the first audio channel and on the second channel record the internal mics as beckup

Why not a an independent wav file in the SD card, with the same file name as the video? That would be the best because the external mic could be stereo or even surround.

Hi, we do appreciate your interest in our Product. We will forward your suggestion to our team for consideration. Thank you for continued support.

We need to be able to use stereo mics (for binaural recordings, etc). I’m willing to give up the audio from the internal mics when external mics are used.