Ashley - I might have a few ideas for the future of C3 if it is implementable. (v2)
My Suggestions for C3:
+Behaviors can be made using the event sheet but still save the option to make a behavior using javascript.
+C3 image editor that can make transparent images, aspect ratio resize or scale, gradient and shapes and also multiple images can be placed inside the image editor to be edited, crop and other useful features of an image editor.
+More coloring and lighting features. ( I don't know much about this , I hope you get the idea.)
That's it for now. The most important for me is that Behaviors can be made also by using events.