shift + drag solo audio tracks
Shfit + Click and drag on solo button selects and deselects solos for each track dragged over. This allows you to solo say A5-A8 in one action instead of having to click the solo button for each track.
Boy, do I have good news for you!
We were originally going to release this feature for just track targeting but based on feedback like yours, decided to keep working on it to add more capability. It will ship later this year but it's available now in beta if you'd like to try it out.
AdminMatt Stegner (Admin, Adobe DVA) commented
This should be available in the current public Beta builds of Premiere Pro as a new feature.