FOSS gamedev and creative worlds

I am trying to figure out how to make a world that has areas that are relatively flat. The size i'm thinking of is over maybe 200x200 and a elevation change above water level of 3 blocks. I try walking (sometimes flying) trying to find the best flat ground by water to start building and with mapgen v6 all i get by the water is a drastic climb of about 10 to 15 blocks. Anyway to add into a mod or mapgen to setup a flat area by water with a gentle rise of 3 blocks.

Reduce the scale of some terrain noises.
A quick example:
Open the minetest.conf file and add these lines:

This will divide the terrain height by 4, but there is still sharp cliffs (even if they have less that 10 blocks height). You may also want to avoid these cliffs, so add this too:

Will this code work with v7 mapgen.