[garyion]

I needed (as everybody of course) the user choice to be put in a secondary group, which is the field "membergroupids".
the usergroupid is a one value field and it's meant to have usergroup id's from 1 to 9 (standard users, admin, moderators, registered etc..) which is "2" as default registration.

I modified the "if not email" script to write "2" in usergroupid and the user choice in the membergroupids.
that might work fine..

the problem is when you are using email verification.. (of course, everybody does).
the user is temporarily registered in a "useractivation" table and the userchoice goes into the usergroupid of the useractivation table.
when the activation is completed from the email link the membergroupids "hack" is lost again. so if you want to modify it as you did for the if-not-email script you can't!

I am a fan of this plugin, I currently have it installed, but I would recommend some vBulletin official user to clarify what should be done and what should not by plugins like this.
I'm afraid I'll have to uninstall it before launching my board, I don't want to have to manually modify the usergroup memberships of every user once it's up and running.

cheers mates