worldgenerator {
overworld {
structure {
dungeon {
large {
B:Enabled_true=true
I:MaxSize_7=7
I:MaxY_20=50
I:MinSize_3=3
I:MinY_20=10
B:PortalEnd_true=true
B:PortalMyst_true=true
B:PortalNether_true=true
B:PortalTwilight_true=true
I:Probability_100=1
I:RoomChance_6=6
B:ZPMs_true=true
dim {
B:Atum_true=true
B:Betweenlands_true=true
B:Caves_true=true
B:Overworld_true=true
B:Underdark_true=true
}
}
}
}
See Probability = 1 part of this
Will generate a GT6 Dungeon at every possible Location.
Seeds do NOT work properly for ANY Mods Worldgen, so that will not help you.