here's a thought, slightly painfull and maybe over complicated, but could you symbolically link the wtf folders over the network?
This way with 5 computers, you could log your characters in on any system and always have the correct UI settings?
It's one thing the really frustrates me as I log any of my characters on my center screen when I am solo boxing but it always takes a bit to get them set up again if I make changes on their "home" computer.

So instead of running the entire WoW off the network, you are only running the addons and the WTF folders.
hmm, I might have to investigate this.