I concur they make great stuff!

I am a bit confused on the wording however, or at least convey the new features.

Taking from the site:
A useful example of inversion multicasting for multiboxing would be having the currently selected channel blocked from receiving multicasts. If selecting keyboard-only multicasting, for example, the keyboard is locked out, but the mouse is not. The user can use the mouse control the selected PC channel and simultaneously use the keyboard to control the other multicast PC channels. In effect, you can control your lead character with the mouse, and your backup army with the keyboard, all at the same time!

Using 5 PC's as an example does this mean that A,B,C,D Is on but E is not? That;s the way I read it. If only E Castings (to reply to tells) and A,B,C,D at time would not, then yes that would be handy. However it just remove one out of loop for no broadcasts I'm not really sure how that would be useful. Perhaps I'm interpreting this incorrectly?