I've only unlocked full-auto, Aperture and Shutter modes - but yes it's a stylised version of an Alpha camera. You can half press to focus, then reposition/compose and full press to capture your image.
Maybe when i get something better than the A100 i'll get more tools, but at the moment, with a 18-75mm lens(e) its all a bit frustrating... The cameras that is, not the game. Which is flawed, but interesting as a concept. Really needs more polish - loading times, menus etc all a bit rough, as is framerate. It's sort of better and worse than Far Cry 2 visually. But definitely a nice chill-out game if you're a photographer.