@Xon, the add-on is great. But I noticed that it ignores sticky threads.
If parent forum or any child forum has sticky posts they are not shown as sticky in agreagate forum. It would be really greate to have an option to control - stick threads in agregate forum or not.
When creating new thread, an option to make first post sticky is available always, even if user has no permissions to stick any post. When editing old post in the topic, it all works fine according to permissions. But with create new thread it looks like a bug.