Hmmm... wonder if we could create a "null" RTE and load that for user settings...
Better said than done! It's been mentioned before about allowing for a "textarea" only option so that an RTE doesn't load for a content box. And, believe it or not, it's just one simple line to add to the core code. I'll be submitting this little addition for the next version, but in the meantime you can make the following change:
Go to the /manager/actions/dynamic/ directory:
Open mutate_settings.dynamic.action.php
Around line 800:
<?php
// invoke OnRichTextEditorRegister event
$evtOut = $modx->invokeEvent("OnRichTextEditorRegister");
if(is_array($evtOut)) for($i=0;$i<count($evtOut);$i++) {
$editor = $evtOut[$i];
echo "<option value='$editor'".($which_editor==$editor ? " selected='selected'" : "").">$editor</option>\n";
}
?>
Change to:
<?php
// invoke OnRichTextEditorRegister event
$evtOut = $modx->invokeEvent("OnRichTextEditorRegister");
echo "<option value='none'".($which_editor=='none' ? " selected='selected'" : "").">None</option>\n";
if(is_array($evtOut)) for($i=0;$i<count($evtOut);$i++) {
$editor = $evtOut[$i];
echo "<option value='$editor'".($which_editor==$editor ? " selected='selected'" : "").">$editor</option>\n";
}
?>
Open mutate_user.dynamic.action.php
Around line 825:
<?php
$edt = isset($usersettings["which_editor"]) ?$usersettings["which_editor"]:$which_editor;
// invoke OnRichTextEditorRegister event
$evtOut = $modx->invokeEvent("OnRichTextEditorRegister");
if(is_array($evtOut)) for($i=0;$i<count($evtOut);$i++) {
$editor = $evtOut[$i];
echo "<option value='$editor'".($edt==$editor ? " selected='selected'" : "").">$editor</option>\n";
}
?>
Change to:
<?php
$edt = isset($usersettings["which_editor"]) ?$usersettings["which_editor"]:$which_editor;
// invoke OnRichTextEditorRegister event
$evtOut = $modx->invokeEvent("OnRichTextEditorRegister");
echo "<option value='none'".($edt=='none' ? " selected='selected'" : "").">None</option>\n";
if(is_array($evtOut)) for($i=0;$i<count($evtOut);$i++) {
$editor = $evtOut[$i];
echo "<option value='$editor'".($edt==$editor ? " selected='selected'" : "").">$editor</option>\n";
}
?>
All this does is add an option to the "Editor to use" dropdown menu to allow setting the editor to "none", thus allowing just a simple textarea to be displayed instead of an RTE. I found this to be handy since I do have times when I want to insert in code that would otherwise get messed up by an RTE.

Another little feature I'll be adding in for the next version is the ability to switch between different RTE "modes" while editing a document via a dropdown menu. Definitely will be handy in those times when you want a given RTE to be the default but want to switch now and then temporarily when you need a textbox or the like.
