ZO seems to be very focused subset of gaming. Is there a particular reason it is not merged with gaming?
This is up to the administrators of ZergOverflow to decide.
Actually -- given the content license, we could programmatically "import" data from it, but we'd have to give proper attribution. (The reverse also applies, obviously.) If you feel this is a good enough idea to implement, ask for it on Meta StackOverflow, where all engine questions belong.