I figured that's what happened (reading the original post too fast).
The skin is just the Modern Cards Dark edition with glynor's update (that's where the blue highlights come from, I believe). You should be able to find his specific skin here on Interact. I like his a bit better than the version that now downloads with MC24.
Anyway, back to the original question, I wonder if what I asked about could be added? Or is it too complex? Or is it possible to select/deselect all in Pane Tagging mode, and I'm missing it?