Good plugin, thanks for the contribution.
I had problems with changing the email notification settings to "Nobody", it wouldn´t change no matter what I did.
For those having the same problem you need to edit the wp_options table in PhpMyAdmin and change the "options_value" number on the following fields:
The representation of the numbers are:
CREATOR_ONLY = 10
ACTIVE_USER_ONLY = 1
CREATOR_USER = 11
NOBODY = 0