Do you know of Windows freeware that has the option to easily lock in a 3:2
or 4:3 aspect ratio for cropping?

Photoscape 3.7
http://www.softpedia.com/get/Multime...otoScape.shtml

1.) select Crop (tab)
2.) assign Ratio/Size-Ratio (checkbox)
3.) enter width / height (ratio)-OK
4.) select crop area
5.) select Crop (button)
6.) Save (button)

Crop ratio will remain sticky.