Feature Request: Is it possible to bookmark subreddits without subscribing to them?

I really like Boost in the few hours I've had to play around with it. But one feature I really want is the ability to have a few subreddits bookmarked (perhaps in the slide out panel) that I can quickly go to.

This is particularly helpful for sport channels when I don't want the score to something ruined until I've had a chance to watch the game.

Thanks and keep up the good work. I really like this app.