Option-click on 'Solo' button will clear other currently solo'd tracks
This is quite common on most DAWs. You really want to 'solo' one track, but don't want to find, and click-to-clear, all the other currently solo'd tracks. Less of an issue on the scale of Hindenburg projects, but such a time saver. Should be easy. :-)
When you're in the neighborhood (code wise), might consider it for the 'Mute' buttons as well. Same concept.
Option-click will now toggle mute and solo for all tracks. Included in 1.52.2110