Option to replace Apple calculator.
The apple calculator is lousy. It doesn't have two-line display to see what you entered or even see it as you are typing. It's like old one-line Casio calculators. You should have an option to replace it if possible.
Thanks, we wish this were possible and you are not the first one to ask :-) Unfortunately, until Apple allows this, we are all stuck with the notification center widget for the time being...