Hi Mouser,
Yes, you understood correctly and yes, it was easy enough to crop with the extra steps but being able to do it right on the canvas would be a nice-to-have.
If you're interested in how I was using it, I started with a blank canvas and was kind of making a diagram to help me think about a problem and I added an image as a reference for a thought. After I added the image I realized that it had garbage on the edges that I didn't want.
So, it's more than just a screenshot captor to me.
Thanks!