I have been having a persistent problem that I would like to add to the "Wishlist." Thanks for maintaining this JavaLawyer.
The FTP server does not understand the ALLO command very well, and this command is required by ftpput (the only way to ftp from my VMWARE server). Apparently, ability to understand the ALLO command properly is a standard. The last firmware update resolved many of these errors (though unfortunately not all). In particular, I receive an "ALLO: 552 Disk full - please upload later" error when uploading large files. I know this sounds like my mistake, but I have confirmed that my 2TB drive can, in fact, take the same 2GB files when transferred via normal command line ftp (see http://forum.magiksys.net/viewtopic.php?f=5&t=104#p450).