While this is arguably your best feature, I think it would be even better if the save file was text based for easy sharing in tutorials.
Done! Curves+ Now saves to an XML file, which should be easy enough to copy-paste to and from tutorials. I'm so generous that I kept compatibility for the old format. Aren't I nice?
I even changed the checkboxes so that they are easier to read, yet still prettier than the defaults.
I'll probably upload in half an hour or so.
EDIT: uploaded. go download!
Awesome!