ldozois - Hidden fields are here in 3.2
frameskip - 3.2 uses the email set for user notifications. I'll think about adding customization options for the next release - too much work already for this one!
Haloscope - I have over 40 options saving, so separating them is just a big database resource waste. You can call any option with the following code:
$regplus = get_option('register_plus'); //gets regplus options from db
$use_password = $regplus['password']; //gets the value for enabling registration password.
All option keywords are listed on line 159 of version 3.2 in register-plus.php under
function DefaultSettings () {
$default = array(
If you need the custom field values, they are in another option:
$regplus_custom = get_option('register_plus_custom');