First of all, thanks for this great plugin! And it's one of the best sw architectural designs that I've seen in WP so far :-) Since three updates ago, I see the following which makes rearranging appointments cumbersome. If you copy or edit an existing appointment, the time field cannot be edited anymore (or sets it to the next available timeslot if editing time is before the next timeslot). Some versions ago, it was possible to set it to any desired date and time.
At the moment, saving the entry replaces the date and time field with current date/time when editing/copying. It would be great to have it editable again because as an admin, I have to reassign existing appointments quite often.
Editing the fields directly in the DB is a workaround but time consuming and might be error prone.
Thanks for you support Isa