First - Fantastic job. One of my favorite programs!
I've started using the High Performance SSH/SCP - HPN-SSH from the PITTSBURGH SUPERCOMPUTING CENTER http://www.psc.edu/networking/projects/hpn-ssh/
This flies compared to openssh, even when the target client or server doesn't have the patch.
I patched and built OpenSSH 5 for Solaris 8 through 10 then installed it on my PC from http://www.psc.edu/networking/projects/hpn-ssh/setup-hpnssh.exe
Even greater speed can be obtained using the "none" cipher for transfering non-critical files, encrypted files or tranfers within your local network where security is not an issue.
All of our servers have FTP and RCP shut off and a separate maintenance network that isn't exposed. Transfering large files (installation and upgrades) across the maintenance network using no cipher cuts transfer time and cpu load.

Thanks for your post. This request is being [http://winscp.net/tracker/show_bug.cgi?id=17]tracked[/url] already.
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Martin Prikryl