Searching for users with quantity X or greater [feature request]

On the trading opportunities page, I frequently use the feature to look for users with a certain card.  It would be very helpful to be able to specify that I'm only interested in users with X or more copies of a card on their tradelist.  If I'm looking to get four copies of a card in a trade, I currently have to click through every user to find the few that have multiples to trade.  This would be a huge time saver.