...currently: no. Simple repsonse ;-)
We could make the HTML/RTF editable, but I am not sure if this is a perfect solution - the RTF/HTML always looks a bit different (font,sizes) than the rest.
What is the thing you edit: a mulit-line, long text? (There are some Java-editors for code input etc. which we could use.) Or is it just one word?
yes, it would be a multiline long-text, i would rework on enter ( kind of syntax highlighting to help the user organizing his (in some cases) very long input by simple highlighting special words...)