Glad you like the theme. The theme already supports multiple single pages and the demo site is an example of the same – we have Home and Home 2 configured as two single pages with their own navigation. Pls load the sample data for see how these pages are built. Basically you use the “Single Page Site” page template for the additional “single page” as shown below –
https://docs.google.com/file/d/0B9j6FQo4cSQFUThCUHEwV0FibUk/edit?usp=drivesdk
Pls note that except for the home page, rest of the single page template pages will have their menu navigation auto-built by the theme based on which page sections they contain. Only the home page and the rest of the default page template pages can inherit the WordPress menu if one has been configured or even this menu is auto-built based on page sections chosen for the single page which is chosen as home page.