Hi, i have an idea for a feature that will make life easy on trading and will possibly make the server very popular and attractive, So my idea is this:
Make a smart merchant mode that will allow us the sellers to put any item that is tradable - on shop, but we will be able to sell it for items.
at first step, the seller will open a shop that look something like this:

(on the "what you pay" area there will be an option to select an item from the items that are on the server as payment
the second step will be the sell, a player open the merchant of the seller, if he wishes to buy the item, he will have to drag items from his inventory and place them on the matching places, for example , in the picture we can see hero gloves, so the buyer will have to drag hero gloves on the picture of the hero gloves and so on for the rest of the items, once done, the buyer will have a confirm purchase button, once he press it, the deal will happen, items will be traded between seller and buyer.
I hope you guys will like this idea, i think it's cool.