This is a simple, but heartfelt request to the Garmin Connect Dev, give us a button in the Courses that allows us to duplicate the course.
This would allow us to take an existing course, which we like, then edit it and save it under a different name.
I could then add 10km, or whatever, to my favourite course without losing the original.
It's surely a very simple thing to achieve, but I'd really appreciate it. :)