If you're searching for retired players prior to Tuesday night (USA EST), it's very difficult to wade through the TL and get to the point where you can view the "free agents" on the market.
Another idea is being able to search by end time - for example, I could search for all auctions ending between 10PM tomorrow and 2AM Thursday. I actually greatly prefer this to the retired player suggestion - but hey, I'd like both.
I was more gearing toward the point that there isn't any reason I can think of to search specifically for retired players. The only difference between them and any other player is the asking price, and you can already control for that through the salary filter.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."