keeping blocks of addresses around is no problem.
changing addresses around in XL is also easily done -- change change the channels in your model.
changing network addresses is also easy, shuffling things around and moving models to a new universe.
the only thing I don't enjoy is moving items around within a universe, it requires that I then update the controller to match, and that means pulling out and connecting the controller. but, I am also a victim of OCD and I also feel the need to move things around to make them orderly.
