It would be great if we could access player events via the reporting API - e.g. play, pause, skip, turning captions on/off etc, for each user session, along with timestamps. A viewing session with a high number of play/pause events is potentially of a different quality to one that has fewer. One that has long periods between pause and play events is different to one with short durations between them. If we could see across sessions and videos how users interact at this level that would be a treasure trove of data. This, alongside the existing second-by-second viewership data would be great to see.