You can try my rotate shader effect. It rotates the _image_ of the object within the object on C3 render (it does not the object itself.)
It has a bunch of fun caveats :)
- It requires 'spacing' in terms of making the DC or sprite large enough that when you rotate the images within the DC.
- It requires the DC to be square (could probably fix this in the effect by taking pixelSize.x/pixelSize.y into account)
- When pasting into DC, DC will be located in the original non-rotated position.
Yes, this may make it too hard to use, but just in case you have a special case that can deal with the above caveats... I've tried it and I get the DC image to rotate.
Of course, I support the idea to add the real function to rotate the DC also though!.