Don't know whether should post into showkase feature request or here.
For starters would really like to use the entire Showkase manager as a wordpress plugin to replace nextgen.
Thumbnails view for galleries and albums as well as seen in http://www.showkase.net/livedemo/Galleries/
List gallery view with Juicebox fullscreen mode http://www.showkase.net/livedemo/list-gallery/

For possible future additions, a more developed API for the galleries to link to more sophisticated user databases. On the go quick selections for users as practiced in image libraries.
All in all - the best fullscreen image viewing on market today, but seriously lacking in versatility.