Publish with out an audio track

When publishing a show, I could use a switch in the Video File section which would prevent an audio track from being created.  I have found that it is much easier to take a show where I need to mix the show with an external video file in a video editor (like Magix Vegas Pro).  I would like my file from Photopia to not have an audio track as I add all the audio in the video editor where I have the ability to have as many audio tracks as I need (sometimes 4 or 5).  When I use Photopia and build a show, I don't have any audio.  I suppose that an alternative to a switch to turn the audio on or off, would be to not generate an audio track if there was no audio in the show.