When a shopper places an order, but then reaches out to tell you about a 'change of heart', it's useful if you can quickly and easily drop the items he really wants into his cart. Void the wrong order, and suggest that he comes back into the checkout and completes the right one!
The Customer Cart Editor lets you find one of your shoppers in your admin console, quickly and easily see what's in his cart, add the items he wants and either check out using impersonation, or invite your shopper to pay for the items you just placed so easily into his cart.