Staying in <P> mode after <H1>

Like everybody else in the universe, I am using the textarea
designMode feature of FireFox to get a WYSIWYG editor for a wiki.

When my users type in the rich-text editor, I would like it to revert
to paragraph mode when they hit Enter after typing headings, and when
they hit Enter twice to exit from lists. But it does not: it reverts
to "nothing" mode, where the text is outside of all HTML blocks. That
is, text they type is not in a <P>...</P> section or any other HTML
construct.

I read the typing rules behavior document at
http://www.mozilla.org/editor/rules.html but the observed behavior of
the embedded widget does not match those rules - especially the rules
that seem to say you can hit Enter once to get <br>, then hit it again
to get <p>. That would be almost as good as staying in <p> mode in the
first place.

Is there any hope? Some JavaScript I can use to configure the editor,
or some mechanism to "trick" the editor into staying in paragraph
mode? Thanks.

-- Allan Pratt, [email protected]