My only tip would be to make standard this plugin, make it look right, and have it remember its settings on a feed-per-feed basis: https://chrome.google.com/webstore/detail/khbjahpecnkenngkid... (Super Full Feeds)

note - the Chrome Web Store has also taken a usability hit, in my view. YouTube was done fairly well, and I think that team should be moved across to do other products, or train other teams about what and how to do things.