I worked out a way to do something that works the same. Create a new layer and select the paintbrush (+ make sure what you want to select is in the layer before the one you just created). Set the paintbrush hardness to 100% and Anti Aliasing to off. On your new layer, draw over what you would like to select. Then, select your shaded in area using the magic wand and select your background layer. Finally, hide the layer where you created your overlay and you have your selected object.
Hope this helped!