I believe /become was the command we used to use in the Quest Troupe but it was limited. You can only use races/mob models that are in that zone. DE invading WC is easy.. DE are a player (PC) model and are universal, as are some npc models like skeletons, etc.
I can't recall ever having a mob (say Naggy) running through a zone it wasn't supposed to be in... and I think that's because it can't be done. I may be wrong, but I'm about 95% sure that's how it was - unless they changed it somehow. My Guiding days are way behind me.
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