Profile information from Simple Registration Extension

I'm running into the same situation.

From looking at the module, a couple of things have to be done.
1. implement the hook_openid(). The hook is setup in openid_authentication_request right before the request array is returned. By doing this, you can tell the openid server to return additional information.

2. then in the openid_authentication function, where the response is parsed, add a hook in the elseif (variable_get('user_register', 1)) block to put the response data into the $edit form. Implement the hook and you can now have access to the response array and the user_register form to map the data.

Would something like that work? I'm about to add the hook to see how it would work.

Actually, scratch the #2 comment above. You have access to hook_form_alter, which gets called when node_prepare is called. Implement the user_register case, and thhe response data will be in the $form['#post']['response'] array element. From there, you should everything you need to put in your own profile info.