Filters

You can extend Rating icons by using the filter redq_rb_custom_rating_icons.

This filter will give you current icon list in the following fashion.

 array(
    array(
        'name' => 'fa fa-star',
        'value' => 'fa fa-star',
    ),
    array(
        'name' => 'fa fa-heart',
        'value' => 'fa fa-heart',
    ),
);

To extend create an array in the same way by using fontawesome icon list. Then returned the merged array. You can also just return your own array.