If I have a reasonably confident IR student, then I will let them turn up to AOB of 30deg, after all rate one should be flown on AOB 20deg with the TC as a guide.
If you teach them not to exceed rate one ever then if it happens unexpectedly I find they panic, I like to get them used to it on the understanding that is not the norm.
IMC student? well it depends on their attitude and reason for doing the IMC, because I believe it is really only to get out of trouble as rarely does anyone stay current.