Re: Clarification on using safe-local-variable-values

[Richard Stallman]

    > !  -- to apply the local variables list, and mark these values (*) as
    >       safe (in the future, they can be set automatically.)\n\n")

    For Emacs -Q, you should not be prompted to save, since there is no
    custom-file or user-init-file.  I will change this.

You can't save them for future sessions, but you can save them for the
rest of the current session.  So ! should still be available with -q,
only the explanation should be different.