Just confirmed with ClientCare the only way to disable a scheduled report is to set an "End on" date to some day in the past.
Keep getting the question on if the big red X in "Scheduled Reports Manager" is to delete the actual report itself or the scheduling of it.
If there was an option on the page by Edit, Delete options to Disable send... or something to that nature... would make this hopefully clearer and makes disabling intuitive.
