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For the question in the ps you can use the User by Profile addition, see http://www.muscap...p?cat_id=7. Make certain the link in the Navigation Panelis visible to the desired admins/usergroup only.

The first question is more complicated if you want some fiels to be visible and others not. The easiest would be to make all fields visible to admins only. In that case do not use the modified profile.php but the standard core files. If some fileds should be admin/usergroup only and others not, that would need an extensive modification of the infusion and that will take time (that I do not have available now ;)).