It's sort of been on hiatus as I've been working on other stuff. But it does occur to me that I never officially released the Library version, so I should do that soon.
As for dialing back the sieges...that's a little tougher to do. The game doesn't really give me a decent way to do that. However, as an easy fix you could just restrict yourself to 1 or 2 hostile races in a world gen. Say, Violet Xelics and Bugbears for one world and Chaos Dwarves and Sand Raiders for another. It's pretty easy to do, you just stick all of the entity files you don't want into a folder while you do the world gen and just bring them back out when you want them. Goblins are still in the default entity file with dwarves, humans, and elves, though, so you're kind of stuck with them unless you put in the effort to split them out.