I love the stereo track info display, it has changed the way I use foobar2000.
Since you are adding options for various things, I have a couple suggestions that others might like as well and I'd love to see them as configuration variables so I dont have to remake the changes when I update to latest versions.
1 - Option to disable the leading zero on total time and play time. This can be done
$puts(1,$replace($get(1),0, ))
$puts(8,$replace($get(8),0, ))
2 - Option to display the last played date as the number of days ago, rather than the actual date. Perhaps the YY_MM_DD variable could be extended to allow you to choose from YY-MM-DD, YY.MM.DD, or xx Days Ago.
$get(active)
$if(%last_played%, $puts(diff,$cwb_datediff(%last_played%,%cwb_systemdate%))
$ifgreater(1,$get(diff),today,$ifgreater(2,$get(diff),yesterday,$get(diff) days)),..........)