Here is a copy of my mail to adobe, but I doubt they will pay any attention. I think such a function can easily be implemented by script and I hope it will be useful!
"layer - select all from source"
I want to be able to select all layers that originate from the same source in the project. For example, when I cut 1 video file 98 times, all of these 98 layers originate from the same source file, no matter their layer name or label color.