This is just an educated guess, but you could edit the 'register' template to add the drop down menu. Then in the register.php file find either '$_REQUEST['do'] == 'addmember'' or '$_POST['do'] == 'addmember''. In that section there should be some line that looks similar to $Userdata->set('usergroupid', 3). Based on the the data you get from the drop down menu change the usergroup ID thats passed to that member function call.
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