When you create a world, have a drop-down menu of custom world profiles, such as:
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JUDGEMENT DAY: all factions are mechtoid, permanent or near-permanent fallout
APOCALYPTO: All Jungle world / all factions are tribal / high-tech buildings, research, and gear(guns, armor) are disabled/not present
PITCH BLACK: permanent or near-permanent night, frequent manhunter scarab packs, extra bug nests
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eh?
I would love extra options like that on worldgen or just have some areas of the map that are affected so you can start a colony with very uhh special conditions. Game doesn't need to be balanced around it, but it provides extra challenges or exotic situations for the players that want to spice things up.
Totally in favor of this being implemented in some way shape or form.
Id personally love a "tech race" setup, where everyone starts out as tribal, poorly equiped, and can grow as you grow.
Kinda an xcom vibe