Hello.
I propose to add the .cue PREGAP (if any) value of the first TRACK to
the cuesheet lead-in field. The cdrdao-toc2cue chain will generate
such .cue files if the first track does not start at sector 150.
Example:
    http://www.kalibalik.dk/anders/tmp/710a1109.cue
    http://www.freedb.org/freedb/rock/710a1109
That PREGAP information is currently lost, making it impossible to
recreate the original CD (and thus the CDDB ID) from the flac file.
Patch:
    http://www.kalibalik.dk/anders/tmp/flac-cuesheet-pregap.patch
Makes sense?
Cheers,
Anders.