I found a previous post from lwebb from April or so, asking how to
permanently disable the WYSIWYG editor, and there weren’t any
responses to him.
I too, would like to disable users from changing to the WYSIWYG
editor. I found the RT_SiteConfig.pm option: Set(
$MessageBoxRichText, 0); however, that just sets the default option,
and users can still change this option. Is there a way to
administratively disable it.