I don't do it very often, but sometimes I convert BWAV files to mp3 for transcription. I have yet to find mp3 conversion software that will carry over timecode information from BWAV files into the mp3 tags.
I know from experience that recording directly to mp3 from a Sound Devices recorder will spread all kinds of useful metadata-like information into mp3 tag fields. Timecode, track names, etc... But doing this after the fact via conversion software would be handy.
Now that I've gone Nomad I'm curious to see how the mp3 recording option will handle metadata. It is yet-to-be-implemented currently. Actually, I'm going to HAT!
Mark