Falling off the edge doesn\'t count, that type of area wouldn\'t exist in a more complete environment. It\'s just like that because there is nowhere else to go and they didn\'t want you to run up agains the sky-dome (although you can still do that). This is more an issue of falling through walls into oblivion, which myself and my guildfellows do on a regular basis.
Again though, there shouldn\'t be a need for a manual spawn command, since with combat upcoming that could be abused. Just an auto-spawn if your Y-Position hits some crazy negative numbers.