I just received my 6515 and it works fine.
Scan to Synology NAS via SMB - no problem.
Is there a way to create a shortcut on the startpanel for scanning direktly to my NAS?
Like Scan to Desktop -> Scan to NAS.
Now I always have to chose adressbook etc.
A solid Maybe....
6515 is nearly a Versalink, so you may have One-Touch ability.
Go to it and login as the admin, open the scan location from the address book and scroll to the bottom, choose Customize. If the option to save a one-touch is there, do so and see if it will work as you need, else, the answer is no, you can't do it.