What about an Iframe? Does anyone else have an idea on that. It would still be on the same site. Just use an iframe and add the customer/home.php as the default page. I added an ifram on a site to have phpbb inside there x-cart site. You can see an ifram work by checking out their site
http://www.smilecamusa.com/store/customer/pages.php?pageid=34
and yes I know the flash doesnt stretch across the site but that was what customer wanted and since they paid for it they got it how they wanted it. I do however think this would work for you. Let me know if you need the iframe code to make it work and I will send it to you.