Heya Patrician, since you mentioned you'd be busy till early next year, I went ahead and added the Totals column I suggested, I made it available for download here:
https://docs.google.com/leaf?id=0B1O...uthkey=CNmNiTU

I did modify the formating of the totals column a bit, but you can do with that what you want if you just want to copy the new section over.

The only thing I modified was the power gains section.

EDIT: Fixed a little annoyance, now the Custom 1 and Custom 2 totals will show "n/a", like the Raw Gains Column if nothing is entered into the Custom entries. Also, I learned a little bit more about spreadsheets today.