I know you don't want to know but probably good to know. AA has just introduced a new wanky feature, moving towards ebay type thing with sales classifieds so all sale items in there categories and proposing auctions - just over the top - please don't do that.
Keep the same - well organised system with some maybe some nice features - adding a favourite thread section would be cool where each person can keep say 10 of there favourite threads in a list and you can quickly go to it and find it great for looking back for info on particular resto tips etc.
Keep the most recent 3 posts like you do - up to 5 would be cool
and love the feature of - show new replies to your posts - use that every day and every visit.
I do like a pinside forum feature and don't know if anyone is interested, but under your avatar have your post number and a pinball icon , not like pinside graphical wow factor list have a simple list of what you have games you had, have, wish list and for sale. Maybe another option for the "for sale" have a second icon red $ sign next to your avatar so when posts get listed you could see that a guy has a game for sale and you could click on it and it shows a list of games and then you could PM him / her some scene shots.