I achieved good progress doing the following:
Extending the WebcamPublisher to attach the MicrophoneManager.selectedMic on same stream used for cameras;
Extending the WebcamSubscriber to control the player buffering;
Stop using the AudioPublisher/Subscriber in video sessions.
Now the audio+video appears to be perfectly synchronized, but this configuration added a noticeable delay in presetation slide changes that is using a simple SharedObject. I supose that it's happens due to buffer added in AV stream.
I still have many things to learn about the StreamManager and the rest of SDK, but I will keep trying to improve this synchronization behaviour. Due to these problems I'm finding a strong resistence to adopt LCCS for video included sessions.