Transcription window on video
It would be useful to have an option to have a transcript control for an interactive video. One example is SpeakerText's caption box ( http://www.speakertext.com/captionbox ) but a more compelling case is the video playback used in Cousera, wherein a separate (hopefully positonable) box to the side scrolls the transcript and the transcript also serves as a control to reposition the video.
This would be useful for accessability for hearing impared learners (or when it is not acceptable to have sound or headphones).