I would assume the effects of this are extremely small, and only relevant due to how insanely precise JWST needs to be. I believe they said they were getting in

I would assume the effects of this are extremely small, and only relevant due to how insanely precise JWST needs to be. I believe they said they were getting in the order of 1 photon per second from the dimmest targets, whereas your eye looking at a star in the sky gets millions of photons per second. When you're at that level, these small effects start actually introducing noise in your data, but otherwise the effect is so tiny I doubt it could be used for anything useful.