FTP communications from within NAV

I'm wondering if anyone has ever coded ftp communications inside of NAV using DOTNET calls. I've always used an external, script capable ftp client and then written the script, and shell command file to call the ftp client and passed the script on the fly using a System.Diagnostics.Process call to kick off the command. Relying on the 3rd party ftp client has some real drawbacks.

I've seen the System.Net.FTPWebRequest references in the post here ...
http://forum.mibuso.com/discussion/comment/296536#Comment_296536

However, I need more than a simple transfer... SSH2 with Putty Private/Public keys, etc.

Thanks!