Talkback Control Room

I find it so weird that there is no option to add a second talkback microphone to the control room. I know I can add an audio input channel to hear the musician, but than you lose communication in between switching to a different project…

The control room stays active even when a project is closed, so then only the musician can hear me via the current one talkback.

Is there a solution for this or can this be a feature request?