Clicking on the curve points doesn't do anything. I just retried it thinking maybe I had done something wrong, but still no love.

Re: correction profiles, I'm not sure. Darktable has some, though not as many as Lightroom, so there must be some public source for some of them. This is actually a pretty big deal (for me at least). I'm not a photographer, but I publish a digital/ipad magazine and do most of the retouching work.

http://www.darktable.org

(Not a fan of darktable, but they do some things pretty well).