It would be nice if, while displaying tags, moc would align right the track number tag to align the rest of the tags. Also, when there are more than 100 tracks on a directory/playlist the track order is not displayed correctly: track 100 is sorted before track 10 - see these screenshots
Here's my FormatString:
FormatString = "%(n:%n :)%(a:%a - :)%(A:\[%A\] - :)%(t:%t:)"
mocp, when reading tags, should first count the number of items then align right the %n tag.