Hi Michael,
But the OP was not requiring a multiuser development environment, but a multi-device one. For multiple users on one project surely you would use git nowadays, on github or your own server, pretty much the universal answer (because it works so well).
The issue is about sharing _templates_ and _snippets_ not includes. I am going to start on modifying F. to support that. Should not be difficult. It's a logical request, and an idea that would not have been thought of before cloud services became widely available.
Sure, you can load a file and 'save as'. But 'new from template' is currently supported and a nice function.
Andrew