MODE Z

Some ftpservers, like the wonderful Gene6 FTP Server, support MODE Z, zlib on-the-fly data compression.
SmartFTP is said to support this feature, but i can't find references anywhere, How do I use it with SmartFTP?

smartftp 2.0, which currently is in pre-alpha state, is going to support MODE Z, see https://www.smartftp.com/forums/viewtopic.php?t=7710