FOSS gamedev and creative worlds

I was thinking if it would be possible to hack into the mapgen and using some sort of program to alter it.
Is this possible?

At the moment, despite the grandiose name of mapgen.lua is only an additional (or all?) generation of ore, the main generation of map still in the code of the game

You wouldnt "hack" the game. You would need to learn to compile first.

You mean edit the mapgen.cpp? Once I did that to produce a completely flat map with nothing but stone < 0 and nothing but air > 0.

there is some mod (out or under progress i dont know which) that generates the land to be completly flat grass

other then that idk...i dont know how to write mods or anything :p

Ok...