Cursed crowfoot is an older name for this species. Now it is often just called a buttercup. I think the old name is more fun, and separating this nasty from its nicer kin may be a good strategy. In those old days it was used to treat skin problems. I suspect its main value was as a counter irritant. It does seem to have been used carefully. Gerard of Cremona, around 1150, says "they may require a very exquisite moderation". Even more so if you're going to eat it, as some north Europeans have. If you are desperate enough you can boil and eat the young plants, but please don't!