I also wonder how it would work if you used "Expeditied Flat Rate Shipping".. And in the template footer state the Expedited means "FedEx ground with an estimated delivery timeframe of x days... Quicker shipping is available upon request. Email me at <a href mailto"xxxxxxxxxxx>" and put in an Ask me button.
It could work out well.. Might try one or two and see what happens.
Re: EBay: Shipping Dictator