Hi Sandy,
1) Auctiva actually does support store listings. To create a store listing through Auctiva, just check the bubble next to "store item" in the sale type section at the upper-left of the Auctiva lister page.
2,3) For further assistance with these matters, please file a support request using the appropriate link on our help page:
http://www.auctiva.com/free_auction_software_help/help.aspx
-Mike