I use Launchpad to open programs, and the Dock only to see what programs are running. As you can imagine, it would be extremely nice if there were a way to drag an icon off the dock using three fingers on my trackpad and have it quit the running program. I'm not yet super-knowledgeable about the inner workings of OS X, but am getting comfortable with terminal. I have no clue how to go about this. Any takers?