Вопрос: Как удалить ненужные мне сортировки — по рейтингу, по модели (в категориях и в результатах поиска)?

Ответ: Откройте файлы ../catalog/controller/product/category.php и ../catalog/controller/product/search.php и удалите в них эти строки:

if ($this->config->get('config_review_status')) {
$this->data['sorts'][] = array(
'text' => $this->language->get('text_rating_desc'),
'value' => 'rating-DESC',
'href' => $this->url->link('product/category', 'path=' . $this->request->get['path'] . '&sort=rating&order=DESC' . $url)
);

$this->data['sorts'][] = array(
'text' => $this->language->get('text_rating_asc'),
'value' => 'rating-ASC',
'href' => $this->url->link('product/category', 'path=' . $this->request->get['path'] . '&sort=rating&order=ASC' . $url)
);
}

$this->data['sorts'][] = array(
'text' => $this->language->get('text_model_asc'),
'value' => 'p.model-ASC',
'href' => $this->url->link('product/category', 'path=' . $this->request->get['path'] . '&sort=p.model&order=ASC' . $url)
);

$this->data['sorts'][] = array(
'text' => $this->language->get('text_model_desc'),
'value' => 'p.model-DESC',
'href' => $this->url->link('product/category', 'path=' . $this->request->get['path'] . '&sort=p.model&order=DESC' . $url)
);