Mart's still missing in action, so I'm doing more: You can click galleries now! (oh boy)
Go read the S2 source for everything... that's a lot more fun:
$ cd bin/upgrading/s2layers/
$ $EDITOR *.s2
I've changed my mind about 10 times over how I want to implement (well, store in the database) palette-modified nav icons on the server, so I'm going to sleep on it. Hence, the goat's still there as a placeholder.