If I get yaw from the protocol (like I do with UDB_Extra) then I show that in the 3D model on the left. Both the GE model and the heading indicator take heading values from the GPS.
In the case of UDB_Extra, in the F2 message, arguments 7 and 10 make up yaw. Argument 15 is heading.
A couple questions regarding the GCS, First how do you change the dispalyed model type? The latest release has an Easystar and I noticed this example is using a Fun Jet. Second question, where do I find info on Live View and what is required to make work?
Video audio channels are limited in baud rate, but with newer 5.8ghz transmitters, audio is sent stereo, so potentialy you could split data over the left and right channels.
FYI, Here is latest screen shot of my testing of APM, Rangevideo OSD, and HappyKillmore GCS