The big exploit is to hold down a stackable item with a decorator tool (probably other methods work as well, though the decorator tool is the easy way), then .grab it. The original item stays in place because its being held, but because of the autostack stuff, .grab was giving a copy of the item.
As I'm sure you noticed, I didn't actually fix the exploit in the script. I just logged anyone who may be using it. I like to occasionally catch exploiters by leaving known bugs open, but logged. The theory is to make people afraid to use an exploit they find because I may already know about it.
Of course, I may as well fix it now, since everyone knows about it
