Ok this hack is fine but what you guys missed is the image at the AdminCP login site. If you make a mouseover the version number appears anyway.
One line above your edit the adminfunctions.php says this:
PHP Code:
<td><img src="../cpstyles/<?php echo $vbulletin->options['cpstylefolder']; ?>/cp_logo.gif" alt="" title="<?php echo $vbphrase['vbulletin_copyright']; ?>" border="0" /></td>
So it is the vbulletin_copyright phrase, is it allowed to remove this one? I mean it is just a picture text.