As per Trai's description of this capibility in the discussion had about The Matrix in the Off-Topic forum.
DVDAE should not show subtitle streams nor their decoding settings, unless they're supposed to be active in the PGC. And a method to activate, i.e. make them appear (and disappear) in a particular PGC's Right Pane data, should be provided.
That's why you can't toggle the subtitles during PGC 6's presentation, because those streams which would be needed to toggle to are not available in the PGC (kinda like UOPs for subtitles), even though they're present in the VTS.
Currently, we hint at the unavailable streams in a PGC (a little detective work is needed); they'll a lot of times be the ones with all the subtitle decoding stream's aspects with the numeral setting of "0" in the pop up menu (which needs to say "not set", as it's not really subtitle stream number "0").
Thanks for bringing this subject up. It would be a great capability to add, which I'm sure eventually will be done.
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