As of build 946, this bug still hasn't been fixed. This is my bug report from March 21st, 2014: Original thread: LINK
I don't think you can tick a box for each camera so that it picks up the audio at the correct position. If it was, then there is not even a single camera set up correctly in any rF2 track available to date. It's simply a missing feature I guess. You can fly around with the freemove camera, but the audio will always be picked up from the initial spot before you moved the camera. Quite odd though because it was supposed to be fixed by now.
Correct.. this is a game limitation. Gerald's cool Drone plugin really drew attention to this limitation. http://isiforums.net/f/showthread.php/22446-Drone-Camera-Plugin