There should be a command called /trade. Because there will be no scams. The trader will know if the other is telling the truth of /trade. Here is how it should be. You would shift and right click the person you want to trade in then if he wants to accept right click that person back then you would inset the item u wanted to trade.
Another thing that could go with this could be money notes so you can trade money notes (from your bal).
I'm kinda confused with the idea "You click a player to trade with them". I think /trade would be a great command, though. As long as there is no duplication glitch within it (which I've heard there is), support.
Neutral, It's a good idea for /trade and for item to item trades if there is no duping. Some trades, like rank upgrades they can still be scammed.