To grant a group Full Control to the RDP-Tcp listener on a Server 2012 RDSH server you may open an administrator command prompt and enter the following command:
wmic /namespace:\\root\CIMV2\TerminalServices PATH Win32_TSPermissionsSetting WHERE (TerminalName="RDP-Tcp") CALL AddAccount "domain\group",2
Alternatively if you have a Server 2008 R2 server you may use RD Session Host Configuration (tsconfig.msc) to connect to your Server 2012 RDSH server and modify the RDP-Tcp listener permissions that way.
After making a permission change you should log off any users that will be the target of a log off so that the change will take effect. I have not tested to make sure that a non-admin user with Full Control still has the ability to log off other users
under Server 2012 like they could under Server 2008 R2 and earlier.
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