Portfolio Gain/loss calculation

I dont track my holdings in the SA portfolios, so it appears to calculate my assumed portfolio gains/losses based on dollar price change for the stocks in my portfolio.  it would be preferable to have it calculate it assuming equal weighted holdings which is more realistic.

Example is if you have GE (a $5 stock) and Amazon (a $2000 stock) in the same portfolio, the calculation is way skewed for amazon - and typically I would have a lot more shares of GE than Amazon.  

Just an idea - if its an easy change that would be great.