I just want to double check whether this mod is not against the vb license terms. See below link about providing the URL, if you have multiple domains, which url are you supposed to enter in the member area?
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http://www.vbulletin.com/faq.php ============================
I have purchased a license. Am I allowed to run two copies of vBulletin?
No. You must hold a valid vBulletin license for each individual installation of the software (regardless of whether the two installations are on the same domain name or server). For example, if you wish to install one copy of vBulletin at
http://www.yourserver.com/forum1/ and another copy at
http://www.yourserver.com/forum2/, you will require two licenses. Please note that the license agreement specifies that you must submit the URL where your vBulletin license(s) are installed (via the online members area). For complete licensing terms and conditions"