is there a right click context menu extraction option available so you can unzip .zip .rar etc files on a remote server using ftp? please tell me how to do this. why isnt this natively (by default) supported
I don't think Opus explicitly supports this, and I don't think you can change the right-click menus for FTP files either, but you can "trick" Opus into doing what you want.
Create a toolbar button which runs this command:
Copy FILE {filepath$} EXTRACT=sub
Then select the archives on the FTP site and click the button. It should extract each one to a subdirectory in the destination.
This works because using {filepath$} on FTP sites causes the files to be downloaded to a temp directory before being passed to the command. (Unless you add @nolocalizefiles to the button to prevent it, which is rarely desired.)