The live data url is in udp://domain:port format, and the server is just plain UDP listener that receives the NMEA data (GGA sentences). Currently there is no receiver server for this feature yet, but anyone can write their own of course.
BTW: I'm not sure if the feature works anymore, it's been left untested for a few versions, I will hopefully test it for next version.
Agreed, that would be really cool. Maybe some day. Before that it's ofcourse possible to implement something to support existing services (If I can find a suitable).
To use the current "send live data" feature to do this would be a lot of work. It does not send lap times, but only raw position data. I will look in to this during spring, when I have some of the current prototype features out of the way.
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BTW: I'm not sure if the feature works anymore, it's been left untested for a few versions, I will hopefully test it for next version.