this is possible!
select the song and press delete (or right-click on it and select remove)
a pop up box will appead and ask you wheter to delete it from the DB or from the harddisk!

High Jiri,

nice work, I really like your player/DB. At the moment for me two
things are missing:

1) local freedb support (posted already in the according thread.
2) When checking your mp3 collection for multiple versions of a track,
it should be possible to delete the track directly on the harddisk (and not
only clean it from the db). This would help very much organizing your
mp3 collection if it is getting bigger. Afaik, this not possible yet ?

Carry on

Carsten