I think it would be nice if different devices using the same morgen account would be able to have their settings (enabled calenders, 12/24 hr, default calendar for tasks/events).

Of course, some people would want these to be different so there needs to be an option to disable this for certain clients.

A suggestion that might be simpler to implement: for new devices copy the settings from the last used device. That way the ones the user keeps the same will be present and then they can modify others.