[TimeZone]

Other skins, such as Aeon Nox, have this. As you watch TV shows, their UNwatched icon gets checked, or goes away. It's how you can quickly get to the next episode without overlapping.

Aeon Tajo works in the opposite but this serves exact same purpose if I undertand you correctly 

What you want: Say your UNwatched items are marked blue, after you watch the item, the blue icons goes away. At a glance you know all items with blue icons are UNwatched, those without blue icon are watched.

Aeon Tajo: Your UNwatched items have no icon. After you watch the item it gets a red icon. At a glance you know all items with no icon are UNwatched, those with a red icon are watched. You can't accidentally skip an episode because all episodes you have watched have a big red icon, just move to the next episode without an icon.

Same thing, implemented differently. You will get used to this "opposite" method but it works just as great.