Pls, make CheckBox for enable/disable the autostart Akonadi server in System Settings/Akonadi Configuration. It is difficult to disable it in the configuration files manually. And it would be nice if KDE applications can run without Akonadi. Furthermore, each resource Akonadi should be able to be shutdown in its settings without having to remove it from the list of resources.
Akonadi is started on demand, so if any app needs it, it will be started. Otherwise it would not work :)