Hack: Add an extrafield to K2 feed items' title. Part of the view.feed.php item

view.feed.php

            $fields = json_decode($item->extra_fields);
            $item->title = $this->escape($item->title);
            if ($fields[0]->value && $fields[0]->value !== '')
            {
                $item->title = html_entity_decode($item->title.' - '.$fields[0]->value);
            } 
            else 
            {
                $item->title = html_entity_decode($item->title);
            }