This should have been posted on vBSEO's forums, but if you want a cheap fix, under URL rewrite settings choose "Hierarchic directory type URLs with content relevant threads (used at www.vBSEO.com)" or "Non-hierarchic directory type URLs using IDs (used at www.MustangEvolution.com)".
If you have to know-how you can go advance and customize it yourself, but if you don't you're outta luck, but maybe you'll get help from vBSEO, since you did pay for their product.
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