RDS 2012: user management tooling (logoff/logon, send message) => tooling -Powershell-?

Hi,

Windows 2012 lacks GUI for managing multiple users: https://social.technet.microsoft.com/Forums/windowsserver/en-US/a4f240b9-11cd-48fe-9730-ed7cc831c22d/remote-desktop-services-pane-select-multiple-users?forum=winserverTS

Is there some tooling to work around this? Tried f.e. the  Send-RDUserMessage but that didnt work out fine.

Please advise.
J.

Jan Hoedt