I'm not sure what I have done wrong, but I cannot kill off my dwarven civ. I've run world gen anywhere from 2 years to 300 years, changed so many parameters related to dwarven population, but cannot murder them.
I'm using this currently as my most successful low pop setup.
[MAX_STARTING_CIV_NUMBER:1] - seems to work perfectly, I always get exactly 1 Dwarven Civ
[MAX_POP_NUMBER:1] - Seems to in-no-way limit the growth of dwarves in world gen, tried roughly from 1 to 100
[MAX_SITE_POP_NUMBER:1] - Once again, my dwarves tend to put as many people where they want, ignoring this.
[START_GROUP_NUMBER:0] - This seems to limit the amount of living dwarves at year 2, and going forward the growth speed. I have worked it down from 10 to 1 to 0, watching a bunch of world gens, and reading their output texts.
Mind you I have about 150 megabeasts, 300 semi, and 100 Titans, and the goblins outnumber the Dwarves at least 15 to 1 in any world I've done. Almost 300 years in, goblins that started with 3000 members, and are up over 12 or 15K don't seem to have put a dent into the dwarves who start with about 100.
I'd like avoid messing with the Farming tags, as I do want to buy seeds at embark, (pretty much only seeds, and 1 item for each of the Firstborn; anvil, pick, axe, etc. All to be treated as precious gifts from Armok and revered in shrines down the road)
If my hand is forced into hacking some seeds in after embark or some wierd shit I'll do it, but damnit I want to cheat as little as possible.