How to setup custom breadcrumbs with taxonomy?
Not sure if this is the best solution, but you can do that always with theme_breadcrumb() function in your theme like this:

function YOUR_THEME_breadcrumb($vars) {
    $breadcrumb = $vars['breadcrumb'];
    if (count($breadcrumb)) {
        if (arg(0)=='taxonomy' &amp;&amp; arg(1)=='term') {
            $term = taxonomy_term_load(arg(2));
            if ($term-&gt;vid==YOUR_VOCABULARY_VID) {
                $breadcrumb[] = l('Your landing page', 'landing-page-url');
            }
        }
        return '&lt;ul&gt;&lt;li&gt;'.implode('&lt;span class="separator"&gt;&amp;raquo;&lt;/span&gt;&lt;/li&gt;&lt;li&gt;', $breadcrumb).'&lt;/li&gt;&lt;/ul&gt;';
    }
}


I'm assuming you're using D7.