Styles in solution editor (HTML or HTML-like)

We are trying to get some consistency of style across the solutions that are shown to requesters in the self-help portal. I was expecting that, as it is shown on a web page, you would be using an HTML editor that allows the selection of heading tags for solutions, but it appears that it's just rich text.

Although a proper HTML editor would be best, the key requirement is for some simple pre-defined styles so that headings of several different levels (complete with appropriate top and bottom padding) could be created consistently within each article and across all articles.

A secondary requirement would be to use the HTML form for paragraph breaks and line breaks i.e. paragraph breaks having whitespace between one paragraph and another.