Set Scheduled Start Time of a Task when Triggering from a Request

I have set up the triggering of a Task from a Request using the "Automatically trigger tasks once Service Request got Created" option on the Workflow tab of the Request Template configuration.

When a Task gets triggered, the Scheduled Start Time appears to be assigned the current time when the Request is submitted. I have a date/time field on the Request that would be more appropriate to use as the Scheduled Start Time of the Task.

Is there any way to set up an "On Form Submit" Field & Form Rule to set the Task's Scheduled Start Time to the value from the Request's Additional Field? (I'm thinking maybe via a script...?)

Or any other method by which I could have the Task's Scheduled Start Time set from the Request's field?

-- Russ

9.3 Build 9335

MS SQL