The plugin is developed separately. Partly by Altap (authors of Servan Salamander) too. It is also a beta version. If future I'll probably establish a support forum for the plugin too.
I've downloaded new version of Servant Salamander Beta 3 and I found new plugin for SCP/SFTP based on WinSCP core. Plugin version is 18.104.22.168 and author are You,M.Prikryl :-)
But I can't find any information on this site.Is it a hidden development branch? :-)
Great work, Thank You ...