you really shouldn't change categories once the competition has started.

For example I haven't added my apps to list, since I'm waiting for the real submission page to open before doing so.

Edit: but having said that, it might be true that navigation category might be lacking entries. So as long as there is common agreement, then I don't mind. I just don't want to see 100 pages of "what if / unfair rule changes etc."-emails which could appear after the competition voting has ended.