5
Spaw doesn't have, but if you use the editors under gecko browsers (netscape, mozilla, firefox e.t.c) you'll obtain tags in lower case.
That's because is the browser which controls the standar html output.
Koivi and FceEditor strategy is to take the code, clean it and after that show the result to the user.
Spaw and htmlArea show directly the html output without cleaning it.
You can use for example html2xhtml javascript to do the job
http://www.html2xhtml.richarea.com/