Client Response Functionnality (Rating, Commenting, Downloading...)
Since we all ready have password protection, watermark, album/photo download, it would be really great to add Rating and Submiting a selected list of photos. It could be as simple a writing an email with a list of selected picture at first.
Something like that : http://www.lightroomqueen.com/the-turning-gates-client-response-gallery/
That would make Koken a perfect product to showcase our picture to our client!