Enhance OsCommerce Shipping Module

I am looking for a PHP/SQL capable person who can make som important changes to an already existing OsCommerce contribution: [login to view URL],520 Extra features needed: 1. Choose for each product in the shop whether it can be shipped with other items or if it must be shipped alone in its own package. 2. Choose for each product if there is an additional cost connected with shipping this item that needs to be added to the existing tableprice in the contribution mentioned above. To explain this a little bit further: 1. Normally the contribution will add the weight of all the products ordered and find the price based on the zip-codes and weight to a total for the whole shipment. I need to be able to set a parameter in each product that makes sure that this is not added with any other products but will be shipped alone and the rest of the order can then be added for a second package. I need this because some products are pretty large and already pre-packed from the supplier. I imagine a tickbox in every product setup that if ticked indicates that this product must be shipped in an own package. 2. Some products are so large that our postcompany will add a surcharge to the normal tableprices for these products. Therefore I need to be able to make this addition in that single product. I imagine a field in each product setup where I can put in the surcharge which will be applied to the calculated shipping. Please feel free to ask questions if you want me to explain deeper and please state your price. Please check the contribution so you know what I am talking about before qouting on this job.