The vmode and the codecquality is working fine but what I'm trying to do, is to set with max message the codec type and its quality which are only accessible when you send the "setting" message to the jit.qt.grab object (Compression tab). The default selection is the last item of the list and the quality is set to 50%.
This is a total bummer. I wish there was a way to set the jit.qt.grab compressor from inside the patcher. Using the settings menu is just an extra step that should not be necessary every time I start up the camera.