H tags in editor?

You can use the HTML editor instead of the visual editor to manually add markup.

Visual Versus HTML Editor

It’s possible that some of the additional features you might be looking for in a WYSIWYG editor may be available in plugin form. I have not used this myself, but it looks interesting.

Foliopress WYSIWYG

And a writeup on the authors site…

Or you can turn on the “kitchen sink” option in the visual editor and it will add a drop-down for formatting that provides h1 – h6 formatting options.

Wow… Really old thread.

Last button on the right in this screenshot.