Add edit and delete function to popup that shows the days appointments not just new event etc, rather than have to go to new page
Back, save and close button on the same side on each editable page instead of having to page back to the initial edit page to find save button and then have to swap sides to close. Or list all edits on the same page with drop down menus rather than new pages for each field even better. This calendar has the best functionality and display I have found but worst edit, may only be a couple of extra presses or one swap from side to side but Very irritating if editing multiple entries like non standard shifts