I thought it would be great for me and others to subscribe to topics whose title contain one or two words.
Of course words should be specified by me.
Subscribe means receive email notification when such topic is posted.
For instance :
I am subscribed to topics whose title contain either ArrayList or LinkedList or HashMap.
So when posted topic's title contains one of those words, I receive email and quickly respond to question.
I don't see such option now but it would be cool to have.