I just posted Worldmaker version 2.12 up to the website. This one mostly just has a bunch of bugfixes. It should be much faster than it used to be and offsets and centering should actually work now.
Let me know if anyone finds any issues in it. I expect we will update this again, but it may a bit. I have a bunch of half-finished generators I'd like to publish (including a reworked Golden Tunnels), but there's a game project I'd like to get finished first.