Possumbilities, can't you just list it as a non-30 day listing (like select 7 days) then revise it on the Ebay side to 30 days? Like how we do it with the Visitor Counter? You can't select it on the Auctiva side, but you can revise & select it on the Ebay side.
I've never listed anything with Ebay motors, but just curious if this might work?