I say add the code ..
function s2_admin_changes( $capability, $menu ) {
// $capability is the core WordPress capability to allow admin page access
// $menu is the title of the page:
// 'user' for access to personal subscription settings
// 'manage' to allow access to the user management screen
// 'settings' to allow access to the plugin settings
// 'send' for access to the Send Email page
// identify the menu you are changing capability for first
// then return a new capability
if ( $menu == 'send' ) {
return 'read';
}
return $capability;
}
add_filter('s2_capability', 's2_admin_changes', 10, 2);
in functions.php
add it, but go in with an account of a subscriber and I can send messages like, I want only administrators to send emails