Feature Request: Ability to organize servers on the left sidebar by a user-defined type

Basically a file-system-like "directory tree" for servers. Instead of displaying all the servers I'm in on the left sidebar, this feature would give the ability to organize the servers by "types" I define (e.g. youtube, lan group, work, school, etc) on the sidebar instead, and I can explore these "server directories" from there. Maye also the ability to nest "sub-types" in "types", just like I can nest sub-directories in directories in a file system. Also maybe the addition of a dedicated screen to display servers and navigate the various directories, like a file system navigator.