Calvin College would like for a reference to have the ability to decline a reference request so that a student can't keep requesting the reference over and over again. This is a problem for them as they have a lot of angry faculty who do not want to serve as a reference for certain students, and would like for a way to opt out of future requests (from the original request). 

As a reference, I want the ability to opt out of current and future requests from applicants, so that I don't continually receive requests from applicants I will not be a reference for.