I get it that it might be uncomfortable for whole scenes.
But when I set up a material, on a primitive like a cube, a plane or a sphere, just to adjust displacement in relation to the other material properties, it is annoying as hell to restart the IR for every little change.
Here, I strongly assume, an automatic IR update would be most welcome and not very time consuming.
Make it an option, please, if it sucks in a case, users won't switch it on. But for setups of materials, it would be a great helper.
Michael