FOSS gamedev and creative worlds

Hi, i need help modifying world generator in order to create flat world wirh only dirt/grass and sky. No water, no ores, no caves or dungeons. I want to create with some speed (i have slow hardware).

I was hoping that someone tell my what is to by erased from and added to mapgen.lua.

My biggest problem is the caves, so Flatlands are not going to help (much).

i think (from memory) flatlands replaces like this:

Y=+3 and above = air
Y=+2 = default:dirt_with_grass
Y=+1 and below = default:dirt

flatland - not working.
I need generate map WITHOUT caves, dungeons and so on (no air gaps, no lava).

There is a dirty solution. Hack it together in c++. (mostly by commenting lines)

Secondly, I have heard that celeron is busy with recoding the map-generation[citation needed], so it may be that he will add this possibility.