How can I toggle object movement snapping on/off? At the moment I have to hold down the cmd button if I want to snap but I’m building a level in the Unity editor and if I keep doing it this way I’m frightened my finger is gonna fall off! 
The code posted here works well!
http://answers.unity3d.com/questions/148812/is-there-a-toggle-for-snap-to-grid.html
In the post 4.6 Unity GUI environment, there is an option called “Pixel Perfect” in the Canvas, and when selected, will make UI objects jitter and bounce to snaps when trying to move them. If you uncheck that box, your UI elements will again translate smoothly without the jitter and snapping.