I want to add and remove tracks during a MediaRecorder session

MediaRecorder is currently specified to stop recording if a MediaStreamTrack is removed from the MediaStream being recorded. It should be possible to add and remove tracks from the MediaStream without MediaRecorder stopping. The solution can be both allowing tracks to be added or removed when MediaRecorder is paused and implementing WebRTC’s RTCRtpSender.replaceTrack() for MediaRecorder.