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How about using the held +/- keys for the rating? They are unused
at the moment. Would be great!
In fact a good idea. While this is perfectly possible from a
developer point of view, I also see the disadvantage with adding hold
status for the +/- buttons for i.e. increasing/decreasing volume.
You'd have to click, click, click instead of pressing it once until
volume fits your needs. Yet, I'll think about it.