Question about keystroke broadcasting

I did a quick search and think I know the answer to my question, but wanted to ask and make certain. Is there a way to have a PC connected to your Multiplicity group, but exclude it from keystroke broadcast? For example, I use 6 computers with Multiplicity. I frequently use broadcasting but only want 4 of the 6 to recognize the keystrokes. Is this possible? If not, would be a great feature and probably not too difficult to implement.