and playback has to stop when adding files in order to show actual song names in the list.
Huh? First player I've checked that has that requirement.
Also, most formats that define them in a standard way do respect time/fade tags (notably PSF/PSF2).
Not here. Neither MOD, S3M, PSF, nor AHX do that... They just play indefinitely. PSF fade out all right, but don't automatically follow to the next track in the playlist...