Thanks for your suggestion.
We will see, if more people ask for this.

It would be great if the notes page of each site's configuration could include html content, links, or custom actions tags ...

For example, if the site is a web server, the notes page could include links to the administration pages or a link to a certain local or remote action, such as opening another tool with the site parammeters.

In my case I have a Windows server that I manage with an ssh service. I have configured a custom action to be able to connect by remote desktop, but right now, Winscp requires to first establish the connection to that site, to be able to invoke the custom command.