I think in Kit pvp there should be a couple 2-3 trade rooms so people don't steal loot. This will make the players feel more safe with their items, And this will also prevent people from raging as much because they have more likely chance of not loosing there items.
Put an invisible boarder around the trading room that prohibits the use of pearls. Like the arena strait across the ocean from spawn, it was impossible to use pearls there.