[Plugin: NextGEN Gallery] Function request: Crop thumbnail images

I got a problem with nextgen gallery, that you can only resize thumbnail pictures keeping the aspect ratio, or criple the images with not keeping the aspect ration, or crop the image but to square only.
The problem is, that it is impossible to make a functional design without cripled images – I need all pictures to have same width and height, even if it would mean that i will see just a part of the image.
So I need the pictures to crop the center of the image (optimum would be an option per picture to select left top, left center, left bottom, center top, center center, center bottom, left top… or percentage) but not to square only, but to defined width×height.