Now that I've figured it out, I am wondering how much time I've wasted, and wrist fatige I've endured... here's how I set it up:
- From the "Window" menu, go to Arrange -> Keyboard Shortcuts & Menus
- Expand the "Image" section:
- Scroll down to the "Crop" choice and assign your shortcut:
For me, I chose Control+Command+C as my "Crop" shortcut but you can use any key combination you prefer. I went with this one because it's fairly similar to the existing, standard shortcut for Copy (Command+C).