@Alastor01 I hesitate to say that it has 'never' been done (never say never), but if it has I, too, haven't seen it. And like you I don't want to use multiple turns to do something pretty obvious and straightforward. If you're having to cure e.g. poison then the chances are extremely high that you will want to heal at least some of the damage it has caused. If you just need to heal, then that's all the skill does, and it only uses the basic amount of MP.