Sync on devices without external or shared data

After installing sync client , sync at default only my data, without shared and external storage data!
If user want syncing shared or external data, must on hand enable that sync! On every client on multiple devices.

If sync client is installed and running.
Adding for example new sharing from someone, client at default disable sync this new share, and user must enable this new sync data.

I put this to the feature request. As a workaround, you can use the new file access control in NC 10.0. It should be possible to disallow access via desktop client.