Add Lock/Unlock Icon to Audio Channel Mixer

When working in the timeline, I often lock audio layers to prevent accidental changes. However, when using the Audio Channel Mixer, it's inconvenient to unlock a track after editing since I have to scroll through the timeline to locate and unlock the exact track manually.

It would greatly improve workflow efficiency if a lock/unlock icon could be added directly to the Audio Channel Mixer, next to the mute and solo buttons. This would allow quick locking and unlocking of tracks without leaving the mixer, streamlining the editing process.