There’s a “PrefetchURI” function in the Renderer web API that does a SetNextUri I believe.
http://01org.github.io/cloud-dleyna/mediarenderer.html#mediarenderer-interface
Also, if some functions are available in the DBus API, but lacking in the Javascript APIs, they can still be implemented directly using the cloudeebus proxies.
And patches are welcome ;-)
B.R.
Luc