Xara :: Shapes As Image Filters?

Is there any way to set photo settings to a shape, have the shape apply as a filter when over an image.

Ie make a rectangle shape, set it to 50% transparent, and focus -50 contrast +50 brightness +20 then have these effects the photo below

I know I can do this with cloning the image and then create an interesting shape - but this is then fixed to that location over the image -

I want to be able to set these properties to the shape, and then move anywhere over the image
(basically like a piece of frosted glass, placed over a photo. - the glass effects what you see of the photo not just colour but also focus..., but you can move it around)