It would incredibly useful to have closed captions/subtitles displayed when fast forwarding/rewinding. Most people read a lot faster than they speak so it is understandable even at 4x (I sometimes watch foreign language material with non-optional subtitles this way).
I would use this facility when watching, for example, the news. I could absorb the whole content of the evening news in a quarter of the time and then get on with enjoying life. It would also be really useful for those "previous, next, coming up" parts of programmes that annoy me even more than advert breaks.
Any ideas if this is possible or coming soon?