[TurboFool]

The best way I could think of would be to simply move them out of the My Pictures folder. By default it shows the contents of the My Pictures folder and its subfolders, as well as whatever folder the camera stores its photos in. So simply move the photo out of it and it'll disappear from that tab, but still be accessible from Albums.

Any other solution would probably not be much faster, as it would still require you to actively modify each of those photos in some form or another.