1) When I have an item that is P&P included, and it says each extra item will add x to shipping cost, could something be done to allow for minus amounts please.

2) could a tick box or something be added where a seller can simply select items within a category / shop / shop category where P&P is added as a fixed amount, zero or minus x amount. This would be great if possible for me in the trading cards, recipe cards, vinyl, DVD, to name a few of mine. I also think those sellers of stamps, would also be at a benefit too.

If number 2 could be implemented it could help to get multiple sales and allow buyers that want to pay straight away rather than awaiting an invoice.