Not only did I fix PNG importing, I made a whole new import window that allows selecting which images from a sprite sheet to import. I was pre-processing before by slicing them into rows of just the images I wanted. And, that was fine, not terribly painful to use...but, this is better. Still a bit quirky, not sure why some of the ducks on the import grid only have the feet, for example.
I'll try to sort out the foot fetish bug before calling it done...