Since there is going to be more world gen added, is there a way to regenerate the ore in a already active world?
You can add ores to worlds that lacks them (if greg ever adds one), but if its a generation change (like tiny/small/medium/big/huge ore clusters, dropping "ore cluster" items when mined), it will make the world overpopulated with ores, as it just generates them again, not caring about already generated ones.
Not to forget that it can corrupt worlds.