It would be great to have a feature like that and I think most people would like something of that sort.
Not really a feature but still. When speeding up a video the audio gets sped up in a weird way, like it cuts out some parts of the audio. For example if I speed up by 200% the audio only speeds up by 150% and then it's cut up to compensate (if that makes any sense), anyways, just something I've noticed when comparing to mpc-hc and youtube.