I've always wanted to have on Barter a Matcher with the option of matching users that have a specific game from my wishlist. For example, let's say I want to trade for "Shu": I'd want to see a list of users that have Shu in their tradeables and who have something from my tradeables in their wishlist. Basically until now, I was using the classic Matcher from Barter and going through all the occurrences of "Shu" from the result list. I think that this feature might be useful for people like me, who are more interested in acquiring games from their wishlist rather than getting rid of their tradeables. However, I'm not sure if it's worth the effort of implementing it, considering that one already has the information at hand by doing a simple browser search.
Nevertheless, I think there should be an option to collapse/expand the Matcher results. When one has a lot of tradeables, it's pretty uncomfy to scroll through everything.