Add the option to save the Mirror Main setting with lyric cues

We are using the stage display for streaming and lower third lyrics with a green background. Our MS operator always has to switch Mirror Main to No when the song begins and then switch it to Yes when the songs end. In our case, lyric cues always should have Mirror Main = No for the streaming video. We must also be careful to coordinate the Mirror Main switching with our video producer to avoid black or green screen Program video on the stream. Having Mirror Main saved with lyric cues would improve our streaming quality and sooth the nerves of the volunteers.

I understand that this should be optional because not everyone needs it.