Re: How global is a define-global-minor-mode mode?

[Richard Stallman]

    There is one subtlety, which is that if you save the custom option for
    future sessions, it won't activate foo-mode in future sessions unless
    the above code defining foo-mode and global-foo-mode is already
    loaded.  But I don't think that's necessary a bug; it's a flaw but not
    one that's easily avoidable.

That is the bug.  It can be fixed somehow, I'm sure.