Always visible input sound device (microphone) control in the system tray
Always keep the microphone control (if mic is available) visible in the system tray, because it's useful to know the settings in advance, for example before video conference. Now for this you always have to select the GNOME Settings separately... The menu does not take up much space. If this is impossible thought, then long-term plan, the sound quick settings could be redesigned to sensibly cover the out and in audio devices.
We could also make dconf key and let the user decide already how she/he wants this to be.