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<?php
add_action('init', 'ninja_forms_register_edit_field_required');
function ninja_forms_register_edit_field_required(){
    add_action('ninja_forms_edit_field_after_registered', 'ninja_forms_field_required', 10);
}

function ninja_forms_field_required($field_id){
    global $ninja_forms_fields;
    $field_row = ninja_forms_get_field_by_id($field_id);
    $field_type = $field_row['type'];
    $field_data = $field_row['data'];
    $reg_field = $ninja_forms_fields[$field_type];
    $edit_req = $reg_field['edit_req'];
    $field_req = $reg_field['req'];
    if($edit_req){
        if(isset($field_data['req'])){
            $req = $field_data['req'];
        }else{
            $req = '';
        }
        $options = array(
            array('name' => __( 'No', 'ninja-forms' ), 'value' => '0'),
            array('name' => __( 'Yes', 'ninja-forms' ), 'value' => '1'),
        );
        ninja_forms_edit_field_el_output($field_id, 'select', __( 'Required', 'ninja-forms' ), 'req', $req, 'thin', $options);
    }
    if($field_req){
        ninja_forms_edit_field_el_output($field_id, 'hidden', '', 'req', 1);
    }
}