This is an excellent suggestion. It is so excellent, that our brilliant content team has thought of it already and implemented it to a degree. In fact, we do have several areas on each server which are just as you describe. Using the ones on east for a quest which may be on Mistone, however, is something I don't think many of us do. That's a good idea, particularly during peak player times when the lag can seriously hamper an event.
So, thanks for your suggestion. I'm sure many GMs out there will read it and get a few ideas of ways to incorporate what you've suggested.
Respect,
Rhizome