Although I have no idea how to handle this (and I have not really bothered to try since it is a Pro feature), I do have a couple comments.
1) There is atleast one group which are using multiserver zones in their project. (Ross System's Unknown)
http://www.krythoth.com/The reason why very few people are willing to help on this topic, is most likely because almost no one has bothered to pursue it.
The truth is pretty simple on this, if you want to run a server farm tohandle a seriously laid out zoned world, it requires a lot of high dollar hardware. Most people who are using 3DGS (even commercially) are not making games which would require the software to run that, since the cost/returns margin is greatly against them. If you were to try to market your game as a "Be your own Boss" MMOG, very few people would be interested...again due to the high dollar hardware needed to run the system on.
In regards to getting a good answer, contact Conitec - thats one of the bonuses for Pro...one year of Tech support. Also contact Ross Systems. I doubt they will give you the exact answer to your problem, but they are a serious business, so I am sure that some kind of an arrangement could be reached.
