Just added a simple plugin that responds to suspend and resume events, and runs a batch file of your choosing.
https://www.team-mediaportal.com/files/Download/Plugins/Utilities/StandbyTriggerfor0.2.2.0+svn/
https://www.team-mediaportal.com/files/Download/Plugins/Utilities/StandbyTriggerfor0.2.2.0+svn/