I would love to see an option under General -> Live TV -> Quick Guide have a choice that would show me my last X # of channels watched. For example, on big sports days like in March, I may be slipping between 4 different channels and if the quick guide presented the last x # of channels I most recently watched, I could hope very quickly jump between them without having to jump back to the guide or create specific collections.
Let me know if this is something worth adding as I'm guessing it would be fairly straightforward addition to the UI.