In the original 2012 Essentials there used to be a service installed on every client that annoyingly would change the DNS settings to point to the server overwriting any other setting (either manual or dhcp). That was easy to fix by just disabling the "Windows Server LAN configuration" service.
Now in R2 they do the same thing, but it doesn't look like it's done it's the same service. Anybody know how to bypass the DNS override?