Re: Customizing key bindings

[Richard Stallman]

    In the case of define-minor-mode, the use of interactive-p (which
    I tend to dislike) only has "trivial" impact: it is used to decide
    whether to output a message and whether to consider the change as
    "explicitly asked by the user so custom can consider it as a
    user-customization".  This last difference has no impact whatsoever
    as long as you don't use custom.

I agree--for trivial purposes like this, this is legitimate.