1st topic could be...
What is NOT planned as core features for XenForo..
This should stop or at least cut down the amount of threads asking about CMS, Bloggs & Galleries.
I cant be the only who gets sick of new threads covering the same questions over and over again.
A 5 minute read is much easier than taking 10 mins to post something never mind actually using the search function...
A timer and check box could be handy for the must read threads too..