[RedTyger]

Removing everything except $leftcolumn_adcode from the leftcolumn_advertisement template and then deleting:

$adintegrate_lc = '</td></tr></table></td></tr></table>';
$str_lc = '$spacer_close';
$vbulletin->templatecache['footer'] = str_replace($str_lc,$adintegrate_lc.$str_lc,$vbulletin->templatecache['footer']);

from the plugin itself should allow you to do that without any aesthetic shennanigans going on. But if it doesn't then the customising is up to you. It can easily be done, but that does mean a little elbow grease.