No way to not automatically sync new items (files and folders) added to root

This is kind of a special case and I understand the logic behind the current behavior. However, as is, selecting *anything* to selectively sync partially selects the root folder. Anything new added to the root folder is automatically selected and synchronized to the clients. For newly added files this makes perfect sense. For folders, however, it can be dangerous. Being able to ignore external storage is great but it's highly annoying to have the sync client add things on it's own and then try to run around and stop all the clients before it fills their disk.