I personally can see it being done by pressing right mouse button on dot on oscillator you want soloed (so code mutes other oscillators instead - something like reversed action of when you normally press it with left mouse button and it mutes only selected oscillator), I second this!
What do you think about it @Tytel?
is fact that currently it has Learn MIDI Assignment, but other than that it could be absolutely neat and fast workflow and I think people mute/solo oscillator more often than assign MIDI to controls