it's better if the forum allows to do it officially, without step to move topics back and forth between boards.
This is already a fix for a previous problem: it used to be possible to create a self-moderated topic, and keep that status when you move it to a board that doesn't allow self-moderation. That loophole got fixed by removing the self-mod status when moved to such a board.
I tried to find theymos' post about this, but can't find it back.