Understood but I think you got on the wrong side of the tradeoff. 99.999% of sites use the browser scrollbar and that should be a hint (check apple.com and tell me they don't care about branding.) Do you really want to be remembered as the site with a great tech demo AND a bad scrollbar? How can that be an improvement over just "a great tech demo"?

Furthermore I don't appreciate brands taking over my desktop and reducing the usability of my browser (and your site) but that could be just me.