sigma symbol tailoring

[KKing]

Hi,

Can anyone give me some pointers as to where the code behind the sigma 
drop down button is located?

Using the 7 series has a few frustrations (like traditional old excel 
shortcut keys missing) but the main irritation is the sigma button that 
you used to be a simple single click to quickly and easily to get a sum 
of cells now has a dropdown and you have to select Sum (from a list of 
Sum, Average, Min, Max, Count). I can see the benefit of this for some 
sometimes, but not at the detriment of quick and easy summation. Ideally 
this should be configurable for user choice, and the utopic would be if 
you click the part of the button with sigma symbol it would act as 
before just do the summation and if you click on the downward pointing 
chevron you get the drop down. Obviously that would necessitate two 
buttons not one, but it would be far more effecient I suspect for a lot 
of people.

K.