In your router, you can manually enter what ever DNS servers you want.
I use a Linksys WRT54G running Tomato, it allows the setting of static IP addresses to.
By keeping this Roku device simple, it cuts down a lot of their support problem calls, as most people do not know what settings these are. It stops them messing things up.
some of us are using the router provided by our ISP, I am having AT&T Uverse, and the router is a non repleacable piece of equipment that is used to provide TV service as well. Anyway, they don't allow to edit the settings in their router.
I don't want to add a new router in a cascade configuration.
I d much rather have another secret screen where manual config could be allowed.
I like the simplicity of the current screens, a secret screen woudl not change that and add more possibility for those of us who need it.
Anyway, I am going to temporarly set up a second dhcp server to force my dns settings on the box, but it s not a viable option for the long term.