I wish this could work; but the trash bin doesn't come up. The only answer I know is delete on computer, then re-synch.
I think you may have misunderstood: the photos that can be deleted are in Saved Photos. These are far different than the photos synced from iTunes. Photos synced are processed by iTunes and stored entirely apart from, and differently, than Saved Photos.It certainly works on mine. What do you get across the top of the screen when you tap on a displayed picture - not a thumb, but the photo itself? Do you get the icon to email the photo and other icons? If yes, you should have the trash bin in the upper right corner.