Rogative and Imperative

A crucial impediment to Kant's attempt to systematize Morality emerges with his discovery that even a 'categorical' Imperative does not suffice to override the essential independence from it of an addressee, prompting him to acknowledge a 'freedom of choice' in the latter that is distinct from the Rational 'freedom' that is the source of the imperative.  However, he does not go further and recognize that even a potential neutralization of the force of a Command exposes it as a Request, and, hence, likewise, an Imperative as fundamentally a Rogative.  Thus, the introduction of the latter classification has not merely grammatical significance, but Moral import, as well.