Watched Episode Manager
Maybe make a Watched Episodes Manager that's faster from the way we currently have to go through?
Not sure what you mean by faster, but your progress page lists everything about all shows you are watching. It has the next episode, and you can expand each show and season to see exactly what is missing.
No, I've found the progress list, it's great but not what I was looking for when I tried to add Supernatural in my shows. I've watched everything except for the last 5 episodes. So I added the whole show as 'watched' and then had to manually remove the episodes one by one. That's the only thing I find more complex than it had to be. But that's just me I guess..