Crop position – image details vs. general settings

I can change the crop position for a specific custom image size in the General Settings, but I can’t set a different crop position for a specific image in its Details and Options dialogue box. If I select a different crop location in the image details and click Regenerate, the image crop doesn’t change and the selection reverts to the General default.

Is there a way to allow the image options interface to override the general setting? We use a couple of custom sizes that have odd proportions, so the best crop position varies from image to image. It would be very helpful to be able to regenerate those sizes with a different crop position for certain images without having to change the general setting and then change it back afterward.