Hi,
there are currently no commands added by the mod. If you don't want to cheat, maybe you can try this:
craft a few cave entrance and exits and carry them with you.
explore far outside, into an area that has not been created yet. ( note: it is not enough if you just can't see that already yet, as some tiles are created in advance. to be safe, go further)
maybe then you need to wait a bit until the generation catches up.
now you should be able to place the entrance and enter. you could then from within the cave go backwards to your base, and the generation should happen normally.
also a warning that for new terrain, the mod should be active so depending on the settings you used there might not be normal resource spawns any longer. (if you want to keep them, use the "both" setting)