Add ability to bitstream Auro 3D
I'm not sure what you mean. Auro 3D uses a DTS HD container, so it might be initially detected as DTS HD by your receiver, but if you select Auro 3D on your receiver (it's the green button on my Denon remote) you do get Audio 3D with JRiver when bitstreaming.
I just tested this with my Denon X8500HA and the Auro 3D 2014 demo disc (bluray with full menus).
Does your AVR support Auro 3D?