nobody is telling you to devide forums just make a special place for poles so that nobody can complain they are using polish there and thats it.
and the off-topic section would be a bad answer since that section is like a bit trash can.
hang on a second, i thought the whole point of this forum was to enable Polish and other people around the world to join and communicate with each other. Just speaking polish would exclude a lot of people, i think people like the forum the way it is.
having a Polish speaking section, would exclude people which is not what the forum is about. I may be right i may be wrong, i'm sure though Admin will correct me if i'm not :)