So it seems like you should buy a better phone. Even Samsung Galaxy A3 has more control over when you use Open Camera (And no need to alter media_profiles).. You can for example change framerates 24, 25 and 30 fps and audio has superior over 200 kbit/s bitrate. Hear it you can, much more depth in stereo image and more detailed noises at backround.
Still I, and I think many others would like to know is it possible to use higher bitrates and/or other framerates on Z1 C with Open Camera (or any other "full capability" camera apps), editing only the media_profiles? I have understood you don't have to go through Xperia Camera mess. You only edit media_profiles.