In order to create a key binding, you need the name of a command said key binding will trigger.
The main menu is defined in Packages/Default/Main.sublime-menu. If you open that file and search for "new view into file", you will find that that particular entry has a command "clone_file" attached to it. You can now create your key binding like so:
{ "keys": "f11"], "command": "clone_file" }