[Mark.B]

Well I did this.

In admincp/user.php find:

}
			else if ($status == -1)

Add above (changing the variables of course)

// Backend Files
				    require_once('./global.php');
				    require_once('./includes/class_dm.php');
				    require_once('./includes/class_dm_threadpost.php');

				// Setup Variables
				    $forumid = 174; // The forum id that you want the thread posted in
				    $postuserid = 101; // The Userid of the poster
				    $postusername = "Mark.B"; // The username of the poster
				    $title = "Welcome, " . $username; // The thread title

				// Don't change below this line

				// Start thread create
				    $threaddm = new vB_DataManager_Thread_FirstPost($vbulletin, ERRTYPE_STANDARD);

				    $username = htmlspecialchars_uni($username);
				    $allowsmilie = '1';
				    $visible = '1';
				    eval('$pagetext .= "' . fetch_template('welcome_thread') . '";');

				// Insert thread
				    $threaddm->do_set('forumid', $forumid);
				    $threaddm->do_set('postuserid', $postuserid);
				    $threaddm->do_set('userid', $postuserid);
				    $threaddm->do_set('username', $postusername);
				    $threaddm->do_set('pagetext', $pagetext);
				    $threaddm->do_set('title', $title);
				    $threaddm->do_set('allowsmilie', $allowsmilie);
				    $threaddm->do_set('visible', $visible);
				    $tid = $threaddm->save();

				// Update last post stuff on forumdisplay
    require_once('./includes/functions_databuild.php');
    build_forum_counters($forumid);

The only slight issue I have found is this. When you approve an account, the message that says 'User accounts validated and users notified" is missing the sort of "silver header bar" it normally has. If you comment out:
require_once('./global.php');
then the header bar reappears, but then the post that is created is blank, it does not contain any text.

I am guessing that using global.php twice is causing the header bar to vanish. This itself is not a problem, however I worry about what other side effects this is having.

Perhaps an expert coder could point us in the right direction as we are NEARLY there!