Once both side agree to a local trade, the trade moves to the completed area, and it is flagged to ask if we want the changes made to our inventory. What if the trade falls through (e.g., the person never shows up, the cards are not in the promised condition)? I would like to see an "Abort Trade" button that would basically cancel the trade and undo any changes to my library.

I have one local trade in a similar status right now (no offense intended to my local trading partner, who may end up seeing this). We agreed to the trade configuration a week ago. It is our third local trade. I drove to his place the first two times, so arranged for him to drive to me this time. We've not been able to connect yet, so I'm sitting on cards and have had to decline other trade opportunities because those cards are committed to the current trade.

I'm certainly hoping he and I will get things squared away soon, but would like the ability to abort (cancel) in the future if things do not go well.

Would anyone else find this useful?

I see your point. In my view it boils down to 2 things:
- a button that would 'unapply' the changes to your sets
- marking the trade as canceled - which has no functional effect other than that the trade will have a different 'tag' in the listing

The fist of them we can do pretty easily, with no change to trade 'states' in general. The second one I'm not yet too sure about.

The first would be great--to reverse the trade. Thanks, Sebi, for your consideration.