I don't think there is a filter for number of reviews, but those other things can all be set to certain parameters, and then hit "search".

He is asking for a sort feature AFTER the initial search.  
The way I read that, it would be like I searched for white, brunettes, with small boobs in Chicago, then I got numerous results, so instead of going back to search and adding more parameters, I would just refine the search by filtering the existing results.  

And by the way, number of reviews is right there near the top of the list for advanced searches.