I think a useful feature for managing the Requests section of a user's My Trades queue would be to add the filter feature you use for My Collection. I have 669 games requested and it's a chore to go through all those pages to find a request that I want to delete. If you had the filtering option where you could sort by system and # of results, I think it would make managing one's request list easier. Unless someone out there knows a better way to find a game in their request list to delete it.
Another suggestion would be to have an option in our account settings to change and save the # of results for searches to more than the default number of 12. Whether I'm searching the games for sale section or managing my collection I always change the # of results to 40 so it's less pages to scroll through.