I took a look at the forum and it seems like a very good resource. Thanks for your work there! The ability to thread discussion topics is very helpful for clarity and ease of reference.
Are you planning to divide the Pali section into a number of subsections (beyond the split you already have between 'important' topics and general topics?)
In general I don't believe in setting up a bunch of separate subforums until a need arises, since I've seen some very ambitious php forums that open up on day one with fifty subforums and everyone just posts in the 'coffee lounge' while the rest of the fora get a visitor once every other week.
But for Pali it might be helpful to put in some divisions, for instance a beginner's section where no question is too simple, a section for answering questions about particular words or short phrases, a section for getting feedback on lengthier translations, and a section for more advanced topics/questions. The latter in particular could be valuable to encourage scholars and pandits to come to the group. Some might not have the time or inclination to wade through the beginner's threads, but once we get them hooked we might be able to lure them into helping beginners along more and more :-)
This are just a few off-hand suggestions, and perhaps other categories would work better, but I think it might be a good idea. It could also help for keeping the archived material organized, and help for people doing searches in the database.