So when it comes to trading items with one another, there's always the risk that someone (accidentally or intentionally) is going to pick up the items you drop at another player's feet, especially when done in the spawn areas. I think adding a /warp trade would be pretty beneficial to that problem. I made up a quick design for a safe item trading area that we could have set up somewhere. Very simply, both parties go inside their own rooms and can shut the door behind them. Items are placed in the chest which is accessible by both sides. Safe trading, plainly. Just a thought.
go to a private area (like a private /home or even a SHOP warp) and then chest trade. If someone not part of the deal takes the items then you can get them on warping to steal.