Not sure if WP Review Pro has been enhanced, but I was just noticing that the WP Review 4.0.4 has code that implies support for setting the review author using either custom field "wp_review_custom_author" or "wp_review_author", these appear around line 1081 in functions.php.
$custom_author = get_post_meta( $post_id, 'wp_review_custom_author', true ); $author_field = get_post_meta( $post_id, 'wp_review_author', true );
I have added both of these fields in a post, but they are always ignored, and the post_author is used.
This line of code is the only reference to the 2 author fiel