Single auction which is reverse and forward at the same time

Dear Colleagues,
I have another question about auctions module in SAP Sourcing 10. Is there any possibility to create an auction which is reverse and forward at the same time?

For example:
I want to progress single auction for buying IT hardware and I consider two attributes. First atribute is price, second is warranty. Of course, I want price as low as possible - so bids should decrease. However, I want warranty as long as possible, so bids should increase.

Is there any chance to create that kind of auction in Sourcing 10? I know that in Document Configuration you set if Auction Type is reverse or forward... Maybe bidding format set to "Any Price Bidding" solves this problem?

Thanks in advance,
Przemyslaw