Would a good potential temporary workaround be to jam the zfill() method into the config somehow?

Depending on the system used to list directory contents, having track 1 as "1" in the filename instead of "01" could cause some systems to output the directory listing with an incorrect track order. Having track 1 start with 1 might then result in the next track in the directory listing be track 10. By forcing the track numbers to always be 2 digits, then every system should display the tracks in the correct order when retrieving the directory listing as "01" "02" etc.

Hope that makes sense. I'm not aware of any albums that are 10-discs +, but maybe having disc numbers be 2 digit as well might be prudent.

Filename {track_number} 2 digits

track.py line 172

output_template = output_template.replace("{track_number}", fix_filename(track_number))

⇊

output_template = output_template.replace("{track_number}", '{:02d}'.format(int(fix_filename(track_number))))