I have the same issue on my site, what I did is made an html form that submitted all the variables I needed into table 1, then upon execution re-direct to a plain barebones html version of register.htm with username, password and email as hidden fields in that form from a cookie, and just left the rules and timezone options visible then when the user submitted that, it was seamless and the info matched. - That only solved half my problem though, now I need to make a registration for my other (portal) to automatically add the username, email and password variables to the vbulletin table without forwarding them to the forum.
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