DavidWhy
For those of us that have thousands of items to keep track of, dragging padlocks to items seems highly impractical. Also, what if you change your mind about selling an item? the one month time limit seems highly arbitrary and biased against exchagers, people who are likely to have the most gold. Why should exchangers be at higher risk than the average person simply because they don't want to trap their items away for a month when they could be using them all to make a profit? A blanket ability to lock your inventory for a time period of your choosing makes more sense, as people can make good assumptions as to when they'll be on to manage their trades and can set the unlock feature accordingly. Even then, I think this concept needs considerable work to be a viable option.
This doesn't necessarily create bias, and it IS a deterrent to hackers in the first place. Everyone takes a personal risk when they padlock their item, but I think this is far better than any idea that just looks for an additional password-- it gives users the option to absolutely safeguard an item.
The point is that if you are able to unlock the items manually, then it's not a deterrent to hackers at all. There's always a risk to freezing your assets, but if you want to protect your account, it may be a risk you have to take.
I agree that a better setup than drag'n'drop is possible, though-- perhaps just available as a button when you click on an item!