It now has knowledge about what properties are supported per entry, and what type they are and how often they can be set. It still needs some work, but this will but an initial video: vid

  Screenshot: About A small gui written in GTK+-3.0 with vala to edit your ~/.ssh/config. Download: Url: https://github.com/DaveDavenport/SSHConf/ Download: https://github.com/DaveDavenport/SSHConf/tarball/11.7  

I put SSHConf into git: https://github.com/DaveDavenport/SSHConf/wiki Warning it is not yet ready, so backup your ~/.ssh/config file.