Sam, you are an Emacs user, yet by choice you type your Forums posts
into your browser edit box rather than in Emacs? That seems wacky - I
just copy and paste from an Emacs buffer.
If someone really cared to, it's probably possible to write some sort
of fancy Emacs mode and/or Firefox plugin to improve on the text
editor / web browser interoperation, but plain copy and paste works
well enough.
Btw, there has been some sort of WYSIWYG-style HTML editor supported
in OpenACS for some time. I haven't tried it yet, as personally I
like the non-WYSIWYG nature of HTML and similar markup
styles.