Allow cropping boundaries to go outside the picture frame

Question

Currently, the crop window is restricted to be inside the picture window. When the picture is rotated, the crop window shrinks to prevent it from extending outside the picture frame. This functionality is most often preferred.
However, for some situations, there should be an option to unlock this feature, allowing the crop to go outside the frame. Upon export, white space (or a color of selection) will be substituted for the are outside the picture. What I am asking for is the same functionality RawShooter has!!

Answer 1

I want the feature, but implemented better than in RawShooter. Some photos would look best cropped a certain way but need a little sky or whatever cloned into a corner.
A simple way for Lightroom to provide this is to have the crop box work just like it does now constrained to the images pixels, but by pressing and holding, say, the Alt/Opt key, the box would become unconstrained. Holding down the Ctrl/Cmd key could be used to rotate the crop box 90 degrees by clicking on one of the borders.
In response to the nay-sayers, for many people (see, I'm not just speaking for myself) the idea of workflow is the "flow" part, not the "work" part. For me (and the many people) getting images cropped right is part of the flow. Jumping to Photoshop is an interruption. (Of course, for others the flow is completing each image as they go, but when I do that I am way too slow.)
For the bloat-beware folks, the hard part is constraining the crop box to the pixels, not uncontraining it. BTW - Lightroom's handling of cropping and rotating is WAY better than RawShooter's.