I think JT.exe can do the job..

Take a look at this UDF:
TaskScheduleControl() - Library of UDFs to manage Windows Task

A few other URLS:

http://www.jsiinc.com/SUBF/TIP2600/rh2621.htm

http://msdn.microsoft.com/library/en-us/taskschd/taskschd/task_scheduler_start_page.asp

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/taskschd/taskschd/ischeduledworkitem_setidlewait.asp

http://www.nncron.ru/
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Co