[sk1nt]

Easy done, in zipscript-c.php replace

if (file_exists($filename.".bad")) {
   unlink($filename.".bad");
}
rename($filename,$filename.".bad");
remfile($filename);

with

if ($create_bad_files == TRUE) {
    if (file_exists($filename.".bad")) {
        unlink($filename.".bad");
    }
    rename($filename,$filename.".bad");
    remfile($filename);
} else {
   unlink($filename);
}

If you want the same change for zips do the same change some lines above.