How to disable WSUS auto-restart after windows updates are installed?

Is there a way to disable auto-restart after scheduled updates are installed, weather user is logged on or not. There is an option to disable auto-restart when a user is logged on in the Windows Update Group Policy but no option for when user is not logged on. I would like to be able to restart servers in a more controlled manner rather than having them restarted automatically in the middle of the day.

Thanks.