That's good input. I guess there are pros and cons to both floating and sticky.

But I think if the threads all have the same very clear title in all forums then everyone will know to look for them or can be told to do so. Something like "Official X Forum Moderation Discussion Thread." The first post could be the TOS that is developed around the threads. In such a case, I think floating ones would work. That was how the OMNI moderation discussion thread worked and ime it worked pretty well.