One of my favorite features in Cinema 4d was the ability to do basic math in attribute windows.
i.e.
470 + 20
7 * 4
-= 22
You can do some of this stuff in the Graph editor value window. But the attributes in the channel box and attribute window don't. It just restores it to its original value like when you type in letters. It doesn't have to remember the equation like an excel sheet, just replaces it with the new value.