I eventually went all the way last year and just locked my duchess in with her long-term lover. It took another half a year, but they _finally_ married and just a year later, the first baby was born. In the middle of the meeting hall. She just picked up her sprog and continued partying. To celebrate the occasion, i granted her the title of Champion (she's already expedition leader and militia commander).
When a shell-demanding mood struck (impossible to fulfil, no shell-bearing catchable fish and the elfs have been lazy), i checked some of the not-mooded kids and found one of the girls _also_ liked armadillo shell. Fortunately, she reached adulthood without mooding and i quickly ordered her to make a copper bucket. A few months later, she promptly mooded and made an adamantine floodgate. She's a legendary blacksmith now, but more importantly, she's alive.
One of the holdovers of my flirt with invaders, a web-spitting forgotten beast, was successfully lured into a corridor, sealed in with a pair of raising bridges and put to work with the help of some chained animals on the other side of a fortification wall. I intend to use it as main provider of textiles, and it has produced well over 300 bolts of silk in under two years. I think even more would be possible once i get my weavers set up a bit better.
I wonder if i can come up with a way to make a constantly-flowing underground lava river, to heat the surface river. This way, it could be kept from freezing in winter, which limits the usefulness of my sixteen water wheels. On the other hand, i get 40 power per windmill on this embark and have 840 windpower right now, which is much more than what i need. Especially since all i use it for is a millstone and a proof-of-concept minecart loop sending alternating signals (switching itself between two routes via pressure-plate-activated retracting bridge).