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Bookmarking individual games is a decent enough feature, but I think it would be helpful to people with a lot of tags to allow for them to be bookmarked so you can go straight to that tag/category instead of scrolling through all of the ones you have.

Additionally, you currently can't use the Search bar to pull up a tag and its games (or at least I can't), which I feel is an important feature to have in library/tag management and pulling up games fast if you have a really big library.
You can bookmark any filter you set up. Just filter to the tag you want and then got the book ark I on to save it.