Hi there,
I love how well Syncthing works so far. This is a feature request, that should (?) be fairly simple to integrate:

It would be cool if Syncthing would look for config files in the directory it's running from first and then ideally accept relative paths (not sure if that requires any modification), so that you could put it on a thumb-drive and run it from any computer, thereby updating a shared folder, or creating a backup of said drive. This is working nicely in my head. Don't know if there are any issues to be expected though...

Keep up the great work!