Windows 7 Green "Zoom-to-fit" button from osx in Windows 7

After playing around with a friends mac, I actually found the green plus button (zoom to fit or whatever its called) pretty useful.
So I was just wondering if there is any software or anything I can do to get this functionality to replace the maximize button. If there was a way to add a forth button, that'd be great; however I'm fine replacing the maximize button for a zoom-to-fit button because I find myself using aero-snap to resize windows 9 out 10 times.
Thanks for the help if anyone can.

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