I would add an option to exclude a thread from the search engines.
This is one of the best suggestions I've heard yet, as it is a pet peeve of mine with posting names here at DNF. Many people unaware of the SE indexing factor often get caught off-guard after it's too late and the domain is indexed. It detracts from discussing 'sensitive' domains here at DNF imo.
Live Auction w/ Drop Services & Escrow would be nice - make the marketplace more dynamic, yet complementary to DNF's premier base of domaining knowledge.
Allowing one to see whois in chat from any given page is convenient too.
Could you resurrect the idea of members making $DNF for chatting, with a little extra for Exclusives, so as to encourage more Chat Activity? Increasing the potential for quick, dynamic exchanges of information and knowledge (between those with more experience (presumably Exclusive members, in general, do) and those who are new), as well as the potential for on-the-spot sales. It seemed doable before - just wondering if it could still be effective?
Also, I would add a 'PMs' link for 1-click access to PMs the way it used to be - rather the 2-click process required to use the 'Your Notifications' function. Or, make it such that when you hover over the dropdown arrow next to 'Your Notifications' it reveals the options without you needing to Click it to open it.
Overall, DNF is tops, and we all have our little peculiars, but I'm sure whatever gets upgraded/expanded will be cool - as always!
Best of Luck & Success in All Your Endeavours!