If anything, I think that some sections of the forums could probably be pared down. The "Release the Source Code" subforum hasn't had a new post since 2013 and TB has been pretty unequivocal about his stance on that issue--there's really no need for a whole forum about that one topic. iADOM as a concept I think has been completely replaced by the Steam/NotEye release, so that forum could probably be closed. While I understand TB's interest in promoting challenge of the week, that probably doesn't need its own forum (a sticky thread is probably fine). ADOM RPG? Maybe after it's been released that forum will be more active, but there's only one post on that forum more recent than 2014, which is the one asking when it's due to be released. Again, a single sticky post for the topic is probably sufficient. The dev forums don't need to be visible publicly. Even the ADOM @ Steam forum could probably be combined into this one and the Project Management one. In total there's already 15 different subforums, not counting the entirely separate Steam forum, which has 6 more, mostly overlapping with the ones from here. This is really excessive, IMHO. You could probably make do with half as many subforums without really hampering the flow of the site at all.
I think, if anything, the most beneficial subforum to add would be a spoiler-free discussion area.
Hoping to win with every class, doomed. Archer, Barbarian, Bard, Beastfighter, Druid, Elementalist, Farmer, Fighter, Monk, and ULE Priest down.