Hello!
What is a good advanced world gen setting for a world that is desert-heavy? Having a narrow band of life would be a bonus. Think Athas (not quite Dune, but getting there).
If you want entirely sand (white, black, red, yellow) desert with just one polar region...
Rainfall of zero min, zero max.
Drainage of zero min, 32 max.
Created in DF v0.34.11.
[WORLD_GEN]
[TITLE:SANDWORLD]
[SEED:Wuq0m2su0MWOEcUo2cia]
[HISTORY_SEED:gAcauiIKk4MkmGqSsKuo]
[NAME_SEED:eqCc806yEsqkCsYMGsuW]
[CREATURE_SEED:SOy68iO6oOQyoGwk2co8]
[DIM:65:65]
[EMBARK_POINTS:2500]
[END_YEAR:300]
[BEAST_END_YEAR:300:99]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:0]
[ELEVATION:151:350:0:0]
[RAINFALL:0:0:3200:3200]
[TEMPERATURE:74:75:3200:3200]
[DRAINAGE:0:32:3200:3200]
[VOLCANISM:0:100:3200:3200]
[SAVAGERY:0:100:3200:3200]
[ELEVATION_FREQUENCY:2:9:0:0:0:1]
[RAIN_FREQUENCY:1:1:1:1:1:1]
[DRAINAGE_FREQUENCY:1:1:1:1:1:1]
[TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
[SAVAGERY_FREQUENCY:1:1:1:1:1:1]
[VOLCANISM_FREQUENCY:1:1:1:1:1:1]
[MINERAL_SCARCITY:2500]
[MEGABEAST_CAP:10]
[SEMIMEGABEAST_CAP:10]
[TITAN_NUMBER:10]
[TITAN_ATTACK_TRIGGER:0:0:100000]
[DEMON_NUMBER:22]
[NIGHT_TROLL_NUMBER:11]
[BOGEYMAN_NUMBER:0]
[VAMPIRE_NUMBER:0]
[WEREBEAST_NUMBER:0]
[SECRET_NUMBER:22]
[REGIONAL_INTERACTION_NUMBER:0]
[DISTURBANCE_INTERACTION_NUMBER:22]
[EVIL_CLOUD_NUMBER:0]
[EVIL_RAIN_NUMBER:0]
[GOOD_SQ_COUNTS:0:0:0]
[EVIL_SQ_COUNTS:0:0:0]
[PEAK_NUMBER_MIN:0]
[PARTIAL_OCEAN_EDGE_MIN:0]
[COMPLETE_OCEAN_EDGE_MIN:0]
[VOLCANO_MIN:0]
[REGION_COUNTS:SWAMP:0:0:0]
[REGION_COUNTS:DESERT:0:0:0]
[REGION_COUNTS:FOREST:0:0:0]
[REGION_COUNTS:MOUNTAINS:0:0:0]
[REGION_COUNTS:OCEAN:0:0:0]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:0:0:0]
[REGION_COUNTS:HILLS:0:0:0]
[EROSION_CYCLE_COUNT:1000]
[RIVER_MINS:0:0]
[PERIODICALLY_ERODE_EXTREMES:1]
[OROGRAPHIC_PRECIPITATION:0]
[SUBREGION_MAX:2750]
[CAVERN_LAYER_COUNT:3]
[CAVERN_LAYER_OPENNESS_MIN:1]
[CAVERN_LAYER_OPENNESS_MAX:2]
[CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
[CAVERN_LAYER_PASSAGE_DENSITY_MAX:0]
[CAVERN_LAYER_WATER_MIN:24]
[CAVERN_LAYER_WATER_MAX:25]
[HAVE_BOTTOM_LAYER_1:1]
[HAVE_BOTTOM_LAYER_2:1]
[LEVELS_ABOVE_GROUND:5]
[LEVELS_ABOVE_LAYER_1:20]
[LEVELS_ABOVE_LAYER_2:2]
[LEVELS_ABOVE_LAYER_3:2]
[LEVELS_ABOVE_LAYER_4:2]
[LEVELS_ABOVE_LAYER_5:3]
[LEVELS_AT_BOTTOM:2]
[CAVE_MIN_SIZE:1]
[CAVE_MAX_SIZE:1]
[MOUNTAIN_CAVE_MIN:0]
[NON_MOUNTAIN_CAVE_MIN:0]
[ALL_CAVES_VISIBLE:0]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:2]
[TOTAL_CIV_POPULATION:1]
[SITE_CAP:1]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:0:0:0]
[RAIN_RANGES:0:0:0]
[DRAINAGE_RANGES:0:0:0]
[SAVAGERY_RANGES:0:0:0]
[VOLCANISM_RANGES:0:0:0]
Various random gens of that world produce similar results. A mountainous central region prevents lake formation almost everywhere, in these worlds. Without it, you can get numerous small lakes forming, despite zero rain. Of course, you need to provide a mountainous region as well, but that's taken care of in what I've provided.
The worldgen can be tweaked to have just one big desert (or close to it), but this one has more variety.
And finally, here's
an example that just produces badlands, rather than sand deserts, for comparison.