Just ready everybody's new posts. Personally, I still think my idea would address almost all of these issues, unfortunately I'm not sure if it's possible in the software...
I see a lot of people concerned about the lack of discussion in new b&s. What if there was like, a 'peanut gallery' feature - where you could leave comments on items (or the index threads, if my idea came to fruition), which the owner of the thread would be able to moderate. These comments wouldn't bump the thread up, but it would still let people make their comments, have friendly discussion, etc. Maybe the 3-4 threads with the most discussion could get a spot at the top of the page.
Or, how about a Like button? So if somebody is selling really cool stuff, you could "like" their items, and maybe you could make a special tier for the Most Liked ads.
I saw some people talking about a Buy It Now button. That wouldn't work. However, one thing that would work could be a "Dibs" button. How I'm envisioning this working, is you would hit Dibs, and a box would pop up where you can make an offer at the set price, or type in your own offer. You could then hit send, and if the seller hits Accept the item shows up as sold automatically. This could remove a lot of work, and once an offer is accepted the system could tell everybody else who made an offer that the item is sold. Maybe too complicated though...