I would like to see a trading mechanism that can be activated between two people. I just think it would be a whole lot easier to trade things with other players in the world with this kind of mechanism. I understand that the market is meant to cut down on people advertising their items on the map chat, but more than once have I sold or bought something in the wild after a event and was forced to use mail as a substitute.
This way there isn’t any question of whether or not the other player upheld their end of the bargain and can see exactly what is on the table within the trade screen. Basically, this can streamline the personal trading process and cut down on suspicion.