Thank you so much for your interest with our plugin. Here are the replies for your questions.
1. It works for IE 8 and above.
2. Our plugin only handle the page that you have kept shortcode. So any other pages / post aren’t modified. For back navigation you can use Breadcrumb plugins available in wordpress.org.
3. Ya, we use wordpress db to store shortcode and layout settings. But our plugin doesn’t creates any extra table in your database.