Sure, no problem. This is more of a hack than anything else but here you go. You only need to edit two files (ext.fckeditor.php and cp.publish.php)
Edit the fckeditor extension file, ext.fckeditor.php, in your extensions folder (/system/extensions/ext.fckeditor.php) and remove the javascript onclick and ondblclick calls on or near line 81. The onclick event isn’t used anyway and looks to be leftover code. The ondblclick event is what triggers the editor to show up so we want to get rid of that call.
Change this:
$r = $DSP->input_textarea('field_id_'.$fieldID, $field_data, $rows, 'textarea', '100%','onclick="setFieldName(this.name);" ondblclick="setFieldName2(this.name);"', $convert_ascii);
to this:
$r = $DSP->input_textarea('field_id_'.$fieldID, $field_data, $rows, 'textarea', '100%','', $convert_ascii);
Next, edit cp.publish.php, found in /system/cp/cp.publish.php, around line 531. This is the <body> onload call stuff that we need to add. You can change this section to change all the text fields into fckeditors, or just a selected one. For this example I’ll just show how to change one specific textarea info the fckeditor. To do this, you’ll need to find out what id EE is assigning the field you want to change. The field will have a name and id similar to “field_id_4”. EE seems to randomly assign the ids so the only way to see what the id is, is to view the source of the publish page to find it. Note that if you change field later on that you might need to change the id here too.
Change this:
$DSP->body_props .= ' onload="document.forms[0].title.focus();set_catlink();" ';
to this:
$DSP->body_props .= ' onload="document.forms[0].title.focus();set_catlink();setFieldName2(\\'field_id_4\\');" ';
That should do it. If you want to replace all the textareas on the publish page with fckeditors, you’d want to check out http://wiki.fckeditor.net/ReplaceAllTextareas. In cp.publish.php you would change the onload call to
$DSP->body_props .= ' onload="document.forms[0].title.focus();set_catlink();setFieldName2();" ';
and then in the setting for the FCKeditor extension (CP Home›Admin›Utilities›Extensions Manager) change the configuration to use the code found on the fckeditor wiki page
// replace all of the textareas
var allTextAreas = document.getElementsByTagName("textarea");
for (var i=0; i < allTextAreas.length; i++) {
var oFCKeditor = new FCKeditor( allTextAreas[i].name ) ;
oFCKeditor.BasePath = "/FCKeditor/" ;
oFCKeditor.ReplaceTextarea() ;
Note that I’ve kept the function name setFieldName2 from the original extension file, but I would personally change it to something more descriptive like makeFCKeditor although this isn’t necessary.