Just an FYI,
I was told by a Roku Tech rep:
"Live streams on the DP can possibly be hacked in but are not directly supported, yet. We are working on it now, just have to work out some details for the ad services and will add it to the DP as soon as it is done"
(might not be word for word quote, but, is the spirit of what he told me)
http://www.TVByDemand.com