I run with plug-ins for dynamics & loudness radar on the master track. I like to keep this track locked so I don’t inadvertently adjust the master level (I never want to adjust that).

Only place I see to lock/unlock is the timeline, but if I want to see the plug-in panels I have to dance between timeline to lock/unlock and the audio track mixer to view.

Be very useful if the lock could be on the track mixer too

Would also be useful to be able to hide the submix & master tracks in the timeline.