UNLOCK LAYER TRICK
One quick way to unlock the background layer is by clicking on the padlock icon and dragging it to the trash. If that isn't fast enough you can hold down the Option key {PC:Alt} and double click the padlock and it will unlock just the same.
Brilliant. I am always unlocking my background and the dragging it to the trash or double clicking and hitting cancel was a pain in the (*#$@. Now if you can come up for oen that creates a new layers filled with 50% grey and set to overlay in one hit I will got from impressed to awestruck 🙂