I am not even sure what you are talking about here, you lost me after "... or delminate the option for any messages to be visible that were sent between the Host & Admin".

Again, I never understood why anyone needs multiple forums on a single portal. Despite that, a user's profile is portal specific, not module specific so this is by design.

Well, you could configure your forums differently thus reducing the number of required modules down to one. I have implemented hundreds of sites and never needed more than a single forum, but again I also know every which way the forum module can be used. I understand not every site is the same, I just think people don't think about how to use the forums besides just dropping a new one on a page when they want a new forum.

As for your hide posts, I still don't know what the heck you mean exactly. If you are saying hosts and admin users are exchanging posts between one another, why not use private messaging? Why not create a private forum that only Administrators can see, then no posts would should up that are in there except for people with permissions to see that forum.