Great work with that zipscript !!
the only thing which has to be improved is the deleting of the cache files like
.ioFTPD.psio_cache._mp3_info_
.ioFTPD.psio_cache._rlsinfo_
.ioFTPD.psio_cache._sfv_files_
.ioFTPD.psio_cache._sfv_info_
this is really annoying
but except of this the zipscript is really nice !!