On logintoboggan_user_register_submit the user_save method is called, but there is no other opportunity to hook

A particularly interesting case that anything in the $edit array (which is coming from a simple merge from the $form_state['values']) is passed to user_save('', $edit); which can then persist erroneous values to data serialization of the user object. One approach to this is to allow others to get in before the user_save (as user.pages.inc: user_profile_form_submit shows) through hook_user.

It seems reasonable to allow people to get in on hook_user ($op == submit?) through this module as well...