In biomegen.cfg, you will find names of biomes with the enabled flag set/unset on them. Example:
Code:
"biomes to generate" {
B:Alps=false
B:Arctic=false
B:AutumnHills=false
B:Bayou=false
*snip*
B:BirchForest=false
B:Heathland=true
B:HotSprings=false
B:JadeCliffs=true
B:Mangrove=false
B:MapleWoods=false
}
In this case, the Alps biome won't be generated, but heathland biome will be generated in your new world (as avid players of DW20 packs can confirm). The rest is an exercise for you to look at each biome name and discard.
In terraingen.cfg, you customise how NPC villages are generated in the biomes you choose to generate. Example:
Code:
"allow villages" {
B:Alps=false
*snip*
B:Grassland=true
B:Grove=true
B:Heathland=true
*snip*
}
Once again, we see that alps are to be village-free, but heathland would have a village spawned in it (and DW20 packers can testify to this again).
Hope that helped. Any more questions around this? Or did you have a different requirement?