I have one more question, sorry for that. But I think I am really near to modify misago to my needs.
If I change the URL on the backbutton on category threads overview to "/" (configured it so that / will be the categories page) it will not forward to "/". Only links that work are the normal parent category URL, "/threads/" but just not "/" and also "/categories/" is not working. Do you have any idea why the link to that sites might not work?
Best and thanks again