It would be nice to have an option to mix all recorded audio sources into a single track, rather than storing them separately. Some players will only play one of the audio tracks, which means mixdown has to be done manually after recording.
Pushing this thread, because i have the same request for a different reason.
When i used Fraps it was easy and fast to work with multiple .avi files in avisynth. With DXTory, there are these unnecessary additional steps of extracting, audiomixing, audiodubing to get the final video in avisynth.
Should be a simple option in the Audio-Menu.