FOSS gamedev and creative worlds

Hi everyone,
I've been working on improving the steampunk city map to be used as a hunger games map. I would like to be able to set a spawnpoint in the map. How do I do this?
Also, the world goes to a certain point and then drops off into infinity. How do I enable mapgen to generate terrain around what's already there? When I just enable mapgen, there's a huge chasm between the world and the generated stuff, how do you eliminate that?

Thanks!

Probably what happened was that worldedit was used to delete parts of the map, so you could use worldedit to add something in its place.

Sorry I just know that you can set this in the minetest.conf (this is for all worlds):


P.S.: Yeah SuperTuxKart!! I really like this game and the new engine... +1 :-o