Okay this is above my head. I thought I would be able to figure it out but it's not happening fast enough for me. Can someone help me fix this so that it looks for users on the whole network instead of just on the local server? Thanks.

I have one suggestion as well. I would put the check for usermode like this

menu status,channel {
  $iff($countcs($usermode,N,O,C,A,a,o),User Lister):{ lus }
}

I also changed the menubar to status to make it more usable for those who connect to multiple networks at once.
My reasoning for this is that this way the option will only show up in the popup if they have the correct modes. Keeps the popups more tidy