I also bought the famous Bundle and I’m considering adding special features for that, but it’s not a huge priority (especially now that months have passed since the bundle was released)
Unfortunately because Mitch is an unofficial app, it’s quite difficult to get certain kinds of information, like the platforms supported by a game. Right now I’m relying on parsing HTML and getting info through the games’ store pages. This works well for individual games, but for an entire library this kind of scanning just does not work. I might have to some more research on that.
I won’t add tabbing support for the same reason: it’s too complicated for me. At that point, I’d basically be creating a custom web browser.