Looking at Default Reaper, Shift select with mouse across foldertracks containing hidden tracks does not select them. I would lean to follow suit.
Only reason being, if you're using folders as busses, and have child tracks hidden, you could inadvertently adjust hidden track.
I would go further and say if it's hidden it's not adjustable.
What might be cool, if possible, would be to have the select button of a folder track, also open and close folder maybe via a modifiers or whatever cooler way you can think of.
As far as locked tracks, I'd also follow default Reaper, a lock track that you then hide is a hidden locked track.
Sorry for giving you more work/stress/headaches/coolfunction.lol
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