Hello Pierre, 

Thank you for expressing interest in the Amelia plugin.

1. Here are the hooks that can be used in Amelia:

<?php
function amelia_booking_added_hook($reservation, $bookings, $container) {
}
add_action('AmeliaBookingAdded', 'amelia_booking_added_hook', 10, 3);
function amelia_booking_time_updated_hook($reservation, $bookings, $container) {
}
add_action('AmeliaBookingTimeUpdated', 'amelia_booking_time_updated_hook', 10, 3);
function amelia_booking_status_updated_hook($reservation, $bookings, $container) {
}
add_action('AmeliaBookingStatusUpdated', 'amelia_booking_status_updated_hook', 10, 3);
function amelia_booking_canceled_hook($reservation, $bookings, $container) {
}
add_action('AmeliaBookingCanceled', 'amelia_booking_canceled_hook', 10, 3);
?>

2. We do not recommend adding multiple user roles of Amelia to a single user (Amelia Customer and Amelia Employee, for example). Roles have their own capabilities and if you combine them, the plugin will run into a conflict it can't resolve (a paradox, so to speak).

Hope this helps you.

Please reach out to us if you have any other questions.