Ben, I noticed in your Network Manager Script that you haven't enabled 'Rename User' yet. This is actually a pretty simple thing to do with '.MoveHere.' Here is a sample from a 'Disable User' script I have. The 'dis_user.txt' is just a text file with usernames in it so I can batch the job.

code:
break on cls

$objDomain=GetObject("WinNT://@domain")

$logfile=@SCRIPTDIR+"\dis_user_log.txt"
$nul=open(1,$logfile,5)

$database=@SCRIPTDIR+"\dis_user.txt"
$nul=open(2,$database,2)
$user=readline(2)
do
	$objUser=GetObject("WinNT://@domain/$user,user")
	if @error
		$nul=WriteLine(1, $user+"	Invalid Username"+chr(13)+chr(10))
		$user+" Invalid Username" ?
	else
		$objUser.Description=$objUser.Description+" (Disabled @date)"
		$objUser.AccountDisabled=1
		$objUser.SetInfo
		; This line renames the user account.
		$nul=$objDomain.MoveHere($objUser.ADsPath, "01_"+$objUser.Name)
		if @error
			$nul=WriteLine(1, $user+"	Not disabled error encountered"+chr(13)+chr(10))
			$user+" not disabled error encountered" ?
		else
			$nul=WriteLine(1, $user+"	Disabled"+chr(13)+chr(10))
			$user+" disabled" ?
		endif
	endif
	$user=readline(2)
until @error
$nul=close(1)
$nul=close(2)
exit