The ability to "link" two views together so that when you zoom or pan one, it zooms or pans the other, would be extremely helpful.
We use Phases to the extreme sometimes. Currently I have a project that has 6 Phases. Partway through the job they changed their minds about when some certain piping would be installed (from Phase 2 to Phase 4) and the disconnecting and reconnecting etc. would have been so much easier if I had been able to see two windows together, zoomed to the same pipes, at the same time, showing different Phases. This helps a person "see" that what they "think" they are doing, is actually what they are doing. And the building was so huge, if one window could have followed the other as I moved along... it would have been fantastic.
