Hi Chris,
This is now in the right section
The graphical illustration of some parameters is a good suggestion, I put it in the list. Drawing the result in the background of a cell when you edit it could be an idea but I fear it will be too small to understand what it represents. Another idea would be to create a special view like the range editor, or displaying the result in a special box.
All ideas are good provided the table remains an efficient way to edit (we cannot mix too many graphics in it).
Regards,
Davy