Custom Bokeh Shapes

While custom bokeh shape effects are technically possible in Blender Cycles, the current approach is a bit convoluted. It involves adding an actual transparent image plane into a scene and aligning it with the camera rotation at just the right distance.

I'd like to propose a simple interface where a custom bokeh texture can be uploaded with a "use custom bokeh" toggle which can be turned on or off.

The Aperture ratio in Blender is really useful for anamorphic type distortions, but custom bokeh shapes from images could add yet another level of interesting imperfection to Blender cameras that mimic the real world.