If you want to have a featured product open to its info page on the home page, your best bet may be to make a Featured category, link the product into it, and select that to be the category the home page opens to.
If you don't want the Featured category to show in the categories sidebox, you can make a simple addition to /includes/templates/your_template/sideboxes/tpl_categories.php to hide it.
Find
PHP Code:
if (zen_get_product_types_to_category($box_categories_array[$i]['path']) == 3 or ($box_categories_array[$i]['top'] != 'true' and SHOW_CATEGORIES_SUBCATEGORIES_ALWAYS != 1)) {
// skip if this is for the document box (==3)
near the top of the file, and add
$box_categories_array[$i]['path'] == 'cPath=xx' or
where xx is the cPath of the Featured category
to get
PHP Code:
if ($box_categories_array[$i]['path'] == 'cPath=xx' or zen_get_product_types_to_category($box_categories_array[$i]['path']) == 3 or ($box_categories_array[$i]['top'] != 'true' and SHOW_CATEGORIES_SUBCATEGORIES_ALWAYS != 1)) {
// skip if this is for the document box (==3)