I would like to make a feature request.
It would be nice if a BS player could send the user data also in JSON format (as brightscript is capable of json encoding). This way we could use the getUserVars and other requests without needing to use libraries such as jQuery to parse the XML then, but use the browser's native JSON parser.
I know it is not that hard to write a parser that would be capable of parsing BS's XMLs, but it always feels better to leave these kind of things to the already integrated capabilities of browsers.