That's one of the things I hate in OS X: many features are there, but hidden until you press some modifier key. Hold shift to maximize. Hold option while pasting to move a file instead of copying. Hold Cmd+Shift+. to see hidden files, and so on. That's the opposite of user-friendly.
The worst example of this tendency? Photobooth. You can press shift and alt to disable the flash and the delay (resp.), but there's no hint of this feature anywhere. I think it's not even in the help or in any documentation.
