Add an "inactive" button for those who work semi regularly

We cannot be the only organisation who employ students who only work for us during their holidays but do so regularly. We would prefer to have an employee inactive button so we can start and stop their employment with us easily rather than have to either onboard/offboard every few months or, as advised by Access, remove their email address for periods of time as this would come with e.g. risks of them missing important announcements, company wide online training etc.