That's a very interesting idea. Apologies if anything below is teaching you to suck eggs...
"etc" in your comment, would include 2.35/2.37/2.40 i assume, 2.37 is a very common projector screen ratio as a compromise to cope with the varying film ratios.
A bit more background for clarity. My screen has fixed masking as demonstrated by the lady from the screen company here
http://www.seymourav.com/masking.asp. This means 95% of the time i have the panels in place and I'm just a regular widescreen viewer. When i remove the panels, my screen is 2.37 native.
I understand that ZoneSwitch (never used) could look at the aspect ratio field of a movie to auto switch (e.g. 16:9, 2.37 (manually determined for my case)). I believe there is no automatic revert and I would always need to manually restore to widescreen. That's OK i guess in the case where i was planning to watch the LOTR extended trilogy back-to-back
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Could or would the user interface scale inside the visible area? e.g. text/images/seekbar etc would shrink inside visible area, zooming would then "restore" the physical size on screen. If so, it would need to dynamically adjust the "list" items, "file info" etc to avoid overspill. Ambitious?
Video playback OSD elements (e.g. subtitles, seekbar, etc) would need to be automatically shifted to be within the user interface. No more (or rarely) having to manually shift the subtitles!
Could video playback remain fullscreen but automatically crop to visible area? Reason, there are some films like "The Dark Knight" that have variable aspect ratios (daft idea), I'd like to see the IMAX fullscreen parts get cropped instead of spilling over. Nice to have.
Would it be possible to get the MadVR top left info panel inside the user interface? One for Madshi I'm guessing and very much a nice to have.
Cheers,
Mark