How to disable Windows Update auto-restart

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 restart in the middle of the
day.

Thanks,

Faisal