1515

[millst]

I use ganging to achieve exactly what you want.
Gang the channels together but only put one of them on your layer.
If something goes wrong glitzy ungang, mute the faulty channel and pan the good channel to center. I never use the stereo input settings for stereo sources as it reconfigures your mixer and limits your flexibility once your in show mode.

Try ganging, I personally don’t think the requested feature is needed.