To paint a world: Create world with new parameters, then, make a new parameter set preferably with nigh to 0 restrictions, or very very calculated ones. I also suggest working with small worlds to start.
When modifying parameters in your set, hit the 'p' key, then use mouse.
Important: read up on your biome - restrictions/qualities before attempting.
Essentially here is what I've done:
I've made oceans of 95 volcanism and an elevation of 1 which surround 1 wide by 3 tall 300 elevation mountains. Surrounding the ocean, is a 'forest' (randomized rain, and drainage) at an elevation of 200.
The forest body connects to the main land -- thus providing all civ access, so long as you have atleast ONE square on the forest/hill/whatevermainlandarea. I've set up 42 (3 rows of 14 such mountains in ocean, center mountain being a volcano (100 volcanism)), in the top right corner, where the painter starts. Savagery, Drainage, and rainfall are universally randomized (though they still are generated according to the meshes I've set up I believe). In the area OUTSIDE of the top-right, I've set up several mountain areas, for dwarven civilization to grow, along with large areas of just plain forest/hill/plains/etc for humans, orc and elvish civs to pop out of.
Generally, because of REALLY REALLY low restrictions, I only need 0-9 worlds created before one is acceptable. Oh, and for the record:
[WORLD_GEN]
[TITLE:SUNKEN GEN]
[CUSTOM_NAME:Sunken Sea]
[DIM:129:129]
[END_YEAR:1050]
[BEAST_END_YEAR:100:40]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:1]
[ELEVATION:1:400:1600:1600]
[RAINFALL:33:100:400:400]
[TEMPERATURE:25:75:400:400]
[DRAINAGE:33:100:400:400]
[VOLCANISM:0:100:400:400]
[SAVAGERY:0:100:400:400]
[ELEVATION_FREQUENCY:5:20:0:0:0:25]
[RAIN_FREQUENCY:1:0:0:1:1:1]
[DRAINAGE_FREQUENCY:1:0:2:3:4:5]
[TEMPERATURE_FREQUENCY:2:0:0:5:10:7]
[SAVAGERY_FREQUENCY:2:5:2:1:2:5]
[VOLCANISM_FREQUENCY:2:3:0:5:7:9]
[GOOD_SQ_COUNTS:500:2500:5000]
[EVIL_SQ_COUNTS:500:2500:5000]
[PEAK_NUMBER_MIN:0]
[OCEAN_EDGE_MIN:0]
[VOLCANO_MIN:42]
[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:100]
[RIVER_MINS:10:10]
[PERIODICALLY_ERODE_EXTREMES:0]
[OROGRAPHIC_PRECIPITATION:1]
[SUBREGION_MAX:3000]
[CAVE_MIN_SIZE:5]
[CAVE_MAX_SIZE:25]
[MOUNTAIN_CAVE_MIN:50]
[NON_MOUNTAIN_CAVE_MIN:50]
[ALL_CAVES_VISIBLE:1]
[SHOW_EMBARK_RIVER:2]
[SHOW_EMBARK_POOL:2]
[SHOW_EMBARK_M_POOL:2]
[SHOW_EMBARK_M_PIPE:2]
[SHOW_EMBARK_CHASM:2]
[SHOW_EMBARK_PIT:2]
[SHOW_EMBARK_OTHER:2]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:40]
[TOTAL_CIV_POPULATION:10000]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:4000:0:4000]
[RAIN_RANGES:0:0:0]
[DRAINAGE_RANGES:0:0:0]
[SAVAGERY_RANGES:2064:2064:2064]
[VOLCANISM_RANGES:0:0:8256]
and because its a complete monstrosity, for those who want a copy of my painted world, I'm afraid it over-caps the character limit. <.< Sorry.
Oh, ASCII diagram of one such island thing: F=forestish area, O=Ocean, M=Mountain, V=volcano.
FFFFF
FOOOF
FOMOF
FOVOF
FOMOF
FOOOF
FFFFF