Crop tool restriction on leveled images

When an image is leveled, the crop tool's boundaries are restricted to the rotated canvas to avoid empty corners. However, if I try to expand the crop rectangle toward an area where there is still room, it gets blocked by the opposite edge that has hit the canvas limit. It would be a great improvement if the crop rectangle could automatically shift or slide along the boundary so it can be expanded into the available space, utilizing all available pixels without needing to manually reposition the corner or center handles.