If my schedule can handle working the "overtime hours" to fit in an order on a rush, as opposed to the full noted turnaround time, Ill offer this option in a custom quote for the whole listing. This should never push someone elses order to be late, but it may be doable to handle it all depending on my workload at the time.
As Judy mentioned, you cannot have a separate listing for something like a rush, but many of my orders are customized already, so the quote and listing is tailored to my buyers if needed.