That you could filter out anything not related to the NBA and off topic forums when you click on today's active topics or view new posts?
Don't believe that's possible. But then again, I'm probably not the best guy to answer that either. It might be possible to do that on the new software, but that won't be released until late August at the earliest (I think. Again, I'm not the best guy regarding this stuff).
If you click on the "basketball", "football", "baseball", etc. drop down menus on the left, you can look at the new posts just for that sport or league.
You can also "subscribe" to the forums you want to frequent and get those listed seperately at the bottom....I have all the ones I frequent seperated....these features are what make the interface nice in my opinion, its customizable for whatever you want....