Replace the title of all items in Omeka's Exhibit Builder plugin with a different field.

exhibit_item_title_switch.php

<?php

/**
 * Replace the title of all items in Exhibit Builder with a different field.
 *
 * Add this to a new plugin, change the field to whatever field you want, and 
 * activate the plugin.
 */

function exhibit_item_title_switch($title, $item) {

    $request = Zend_Controller_Front::getInstance()->getRequest();

    if ($request->getModuleName() == 'exhibit-builder') {

        // Replace title field here.
        $title = item('Dublin Core', 'Description', null, $item);

    }

    return $title;
}

add_filter(array('Display', 'Item', 'Dublin Core', 'Title'), exhibit_item_title_switch);