Not sure. Let me give an example for illustration purposes. I am given an image with an embedded border that is 2:3 ratio. I first need to print as 4x6 borderless. It prints perfectly, no cropping, no image or border lost. Then I also need to print same image on 4x6 card but with a 0.1" Qimage added white border around entire image. This means I need to either crop the image if I want even borders which cuts off part of the border that is already part of the image (very noticeable and not acceptable) or I can have a 0.1" border on short side and 0.07" on the long side. This delta in border is noticeable - it looks like a sloppy cut job.
Instead what would be nice if if Qimage allowed the image to be non-proportionally stretched to fit into the resulting 3.8x5.8 ratio needed to print with a 0.1" border. In almost all cases this small amount of non-proportional stretch is not detectable and acceptable.
Let's back up here and address this problem from the source rather than band-aiding it after the fact. The problem here is not that Qimage won't distort images. The problem is that a border has been inappropriately placed on an image
before print time! Borders should be placed at print time when you
know the print size! Qimage gives many methods of applying borders including decorative borders/frames via cutouts and even placement of photos over border images using freehand placement. The whole concept of Qimage is that you should use it to print original un-fooled-with images. Borders should be done at print time and you wouldn't have to distort your images to counter the fact that the border was added at the wrong time in the printing workflow.
Mike