FeatureRequest: subscription grid mark as watched

First off, i'm not sure this is the place for feature requests. If it isn't please delete/forward to the correct place.

I'm currently using two different youtube-related addons, yours and one called "Better Subscriptions for YouTube". I would LOVE for the features available in "BSfYT" to be added to your addon.

This addon restores the "original" grid layout of the subscriptions tab, aswell as adds a small checkmark in the bottom left corner of videos in your subscription page. Pressing the checkmark will mark the video as watched.
The addon also has a feature to hide watched videos.
It also auto-hides/marks as watched videos that you have started to watch, thereby removing them from the "unwatched" list.

The features of this addon are great, as i'm only interested in around 40% of the content on some of my subbed channels. It's a great way to auto-mark videos i have no interest in watching. In short, a nice video sorting/management tool.

If possible, i would love for your addon to implement these features, thereby letting me have only one youtube-addon installed (the current addon is a fork from the original (atleast afaik) version, "Subscribtions grid for youtube", and it seems uncertain if the current dev is going to update it regularly or not).

The issue does not name any files, tests, or entry points. First clarify which requested subscription-grid features are in scope, then locate the existing subscription-grid implementation and determine how watched state is represented. Done should be defined by explicit behavior for marking videos watched, hiding watched videos, and handling partially watched videos.