Custom Order lets you modify the sorting of results in custom lists used for landing pages, modules, widgets and shortcodes.
The custom order setting diretly changes the database query's ORDER BY statement.
JReviews already comes with plenty of sorting options, but if you insist on being creative, you can do that too.
Order by highest price ascending
Field.jr_price ASC
Order by highest price descending
Field.jr_price DESC
Order by featured status, then alphabetically
Joomla
Field.featured DESC, Listing.title
WordPress
Field.featured DESC, Listing.post_title
Order by number of photos
Totals.photo_count DESC