When you're working on a big canvas and you'd like to see in the review window (at a noticeable size) that certain smaller thing you're working on currently you have to move it to the top left corner, because zooming in on the review window always zooms in the top left corner.
It would be cool if you could (for example) click and drag the view of the review window (not the window itself, but what you see) to wherever you please.