Actually, you have even more options available to customize RCU than before.

At the top of the page you'll notice 6 yellow 'coins' labled for specific categories. The first one is "My Forums". If you click this link you will be able to customize RCU to view only the categories you prefer. From that point on you won't have to view the categories you don't like to see. You may also click "View Subscriptions" on the forum home page near the top to organize your subscribed threads and/or forums. If you click the "Posts since last visit" you'll still get all the new posts from every category since your last visit.

Hope that helps.