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Would be nice if you could enter a measure number in the pdf viewer, and it jumps to the appropriate page and scroll position.
If LilyPond stored the measure numbers in the annotation it would be possible, but not otherwise. So it's a feature request for LilyPond. (I think that would be easy to implement in LilyPond.) Actually LilyPond could generate a lot of other information in a separate file, because when rendering a grob, it has access to the Music element that renders the grob.