Not sure what you have for the Mac client but a suggestion: I can select an album in iPhoto (or event(s) or multiple selects) and then use either contextual men

Not sure what you have for the Mac client but a suggestion: I can select an album in iPhoto (or event(s) or multiple selects) and then use either contextual menu or menubar app to upload photos. No need to drag and drop. When I open iPhoto, that's usually the time I feel like sharing.