it seems that "Track: Select all tracks" (ID 40296) only selects tracks that are visible the TCP.
Is there a way to select MCP only tracks?
And what about completely hidden tracks? Can they be selected?
I've just checked you should undock Mixer to select tracks there.
Click on one of the tracks in Mixer and use Ctrl+A shortcut to select all the tracks.
To select hidden tracks, go to View->Track manager and select them manually.