Hello.
I'm pretty sure I've found a bug. Select any appointment press the right arrow key. Then the first interval after the appointment finishes will be selected. Now press enter to create a new appointment. It will be created but "with zero duration".
Expected behavior is to create the appointment with the duration of the interval.
Please let me know if I should report it and where. Also I'd like to know any progress with the issue.
This is a bug which will be addressed in a forthcoming service release; refer to bug ID 78782.