As you may know, Plex recently added a feature called "Watch Together" where you can sync your playback with your friends. https://support.plex.tv/articles/watch-together
I think that Channels should replicate this feature – not for friends, but for whatever client devices I own.
Take this example: my wife and I are watching a football game, her on the living room Apple TV, and me on my iPad in our home office while I work. As I move around the house, I might catch some of the game on the living room TV, and if it's not synced I could easily miss a goal or a great moment. We try to sync them manually as best we can. This is tedious, especially if one of use skips ahead during a commercial, throwing everything out of sync.
The sync feature should sync up all clients whenever anybody rewinds, fast forward, pauses or plays.
This would be a killer feature. Please consider adding it!