joomla Auction Factory Additional Functionality

Hello, I need some additional functionality for the Joomla Auction Factory script. I´d like all to be done in a plugin versions, no core hacks, unless absolutely necessary. 1. Currency ex-change. right now, each auction appears in a default currency. I’d like to have the currency recalculated according to current ex-change rates (ECB) to display the auction listings in the same currency in order to compare the offers 3. Multiple items bidding. Seller can enter a number of items available. All bidders who meet the reserve price will be winners of the quantities they bid for. 4. Shipping settings. Right now, a seller can add shipping zones per item. I´d like the seller to be able to set the shipping not per item, but per item weight. Consequently the final shipping costs to the bidder will be calculated based on the no. of items won (multiple auction point 2.), the item weight and country of delivery automatically. There should as well be an option to import the rates to the system from csv and export to excel to quick change/update the rates. 5. Alpha User points payment gateway. Thank you