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- Open /includes/classes/class.category.php
At around line 211 you'll see "public function SetSort()". Look for "case priceasc" a few lines down.
Copy "priceasc" and replace the word "featured" in the $sort = "featured" which you will find a few lines above. If you want to sort by review, you'd replace "featured" with "avgcustomerreview".