I just created an m3u from a single mp3 for calibre import and then replaced it in calibre's file location with a full m3u needed for playback locally and on my phone. Works great.
Likely the metadata in the plethora of files for Atlas Shrugged
is redundant anyway. The bulk of the unique information is all going to be in the first file.
Hmm. Perhaps I should see about an options GUI page for the aBook import to set default behavior to either scan all files or only one file in an m3u to get metadata. Hmm.