just few things i remarked:
changing proffesion possibilities on civ-entities take effect immedietly.Whoever adding new items (to the entity direct or ANVIL tag to copper for a civ wich use minor metal) need a regen too.
On an other side if you make a creature not speak during worldgen (so at war with others) then but back can_speak (with a fort starded, becouse you can not control non speaking civ members) all war ends (with non thiefing and non snatching races at least) and elfs come to trade
Not really related but having duplicated creatures makes funny (and buggy) things too (i added a frogman civ but had two frogman creatures. so that is who lizardmans made their own race in my game ... (seen in legends but it crashed soon ...)