Hey @Nick, apparently a firmware update somewhere along the lines removed that ability. The easiest way to change the app shortcuts in the dock is to just install an alternative Launcher that will let you control the dock and icons. If you want to pay you can try Nova (they also have a free version), but I'm using Solo Launcher at the moment (which is free) and I love it. You can add any icons you want to the dock, make folders in the dock, change icons and folder styles, add folder titles, remove the separation bar, put as many apps in the dock as you want, run three docks at a time, and...well, you get my point.
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