[MajinDragon]

Hmm, perhaps this would solve everything?
Upon clicking on either side of the table, two trade screen gui's appear on your screen, one of the right, and one on the left. Whoever has claimed either side will have their Account name displayed as the 'Owner' on the respective gui, Any items he/she places on the table will appear under the account name like a list starting from what was first placed on, to the last, and incase there are many items being traded, a scroll feature will also be possible. To make this feature more easier, everyone can move the gui's and increase/decrease their size either horizontally or vertically. I believe this feature, along with a 3second cooldown between being able to claim another table after exiting one will completely remove table scamming.

Note: The cooldown is because alot of scammers like to exit the table with the item placed, and then instantly claim the table and click accept, a cheap way to scam, but it's used and people do fall for it.

Also the gui's will be like the inventory gui in that you can change it's transparency if your light effects are turned on.