Digest authentication for ftp via proxy

Would me nice to have Digest authentication for proxy settings for ftp. Currently, the Basic authentication is the only possible but it is not accepted by most proxies being insecure (proxy username and password go in plain text over the net). It is possible to use Firefox to access ftp servers behind a proxy supporting Digest and not Basic. But that is not a convenient way for transfering more files.

Thanks for your suggestion.
Will see if more people ask for this.