It might do including keywords in URL, no idea if does or doesn't. But I prefer to use URL's without them keeping the address shorter seeing as there's no proof either way that keywords included in URL make any real difference. Google takes title from "thread title" anyway, and keywords usually come from content I suspect. Meaning keywords included in URL do little for Seo as a whole.
Actually, yes it does. That's why people buy niche-traffic websites.
I own www.mw3blog.com and it grabbed over 8,000 mw3 blog keytype. I own CODForums and it's getting pretty much the same thing. Both have been key typed different variations of the same keyword, for mw3blog, mw3 blog is popular, while mw3blog does bring a significant number of key types by users, but not as much as... mw3 blog. CODForums on the other hand is getting both codforums and cod forums.