To get a perspective, look at the other locals, or other country boards. Tingnan mo yung India and Spanish and German. I can't understand them but look at the board structure.
So, it's possible to add other sections in the Child Boards. Presently, the top 2 in the Poll are Marketplace and Trading so let's hope this will be implemented sooner. Off Topic is a good choice also, but it's in #4 position with 15.7% votes.