Yes, the above does not help if you have two pages. Anyway you can have a single page which links to both of these pages in turn? You can also modify the framework/functions/breadcrumbs.php file at line number 49 to obtain the archive page for the portfolio entry category.
Best and easy way to go about this – you can override the default portfolio page setting for a portfolio entry by having a WordPress custom field named “mo_default_portfolio_page” in your portfolio entry which points to a different portfolio page id. The theme checks for custom field setting first before going to the theme options setting. If the name of the option are same, the custom field setting takes precedence. Hope this helps. More about custom fields in WP here –
http://codex.wordpress.org/Custom_Fields