Softbiz B2B marketplase modification

I need the following customization on Softbiz B2B script: front end - on product view page to show the number of total products that the seller has. - on category page possibility to filter the search by price, most recent - on product page, when "add to cart " pressed from unregistered to pop up window with login or register data and automatically reloading the page when fileds inserted - adding feedback system / it can be taken from other softbiz script, just need to be integrated/ checkout process - availability to choose: to pay to PayPal or to pay on the courier when delivered - when paying PayPal to pay directly to PayPal account of seller seller dashboard - to show how an item has been ordered- via courier or via Paypal - availability to dublicate an offer made for purpose of easy publishing - availablitty to enable or disable an offer - to separate the ordered items from the enquiries / now they are showing togehter - availability with checkboxes to check box the offer : paid ; shipped admin back end to show how an item is ordered by courier or paypal/ report page to show how much a seller owns / generated from the percentage of the each transaction or order/ ONLY familiar programmers with the script can contact me.