Not quite the same thing, but I made my own version of this and wanted to share ( after visiting this and many other threads, searching how to do this ).
I ended up with a manual button that needs to be pressed in the editor, which kind of sucks ( will continue to hunt for how to best hook this in for auto-generation ), but it generates the nav mesh links, and my world content author is very excited to not have to do them manually 
(we have fairly large worlds, which can have ~1000-2000 links generated in it )
