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I like the topic IDs at the end. However, I am wondering why the URL isn't "hierarchical" in nature.

IE: something like this http://xenforo.com/community/XenForo-Discussions-Questions/can-we-customize-the-url-pattern.1534/

http://url.com/board-name/topic-title.id/

I run a google custom search and had trouble including select boards when the URLs didn't identify which board the thread belonged to.