Would like the ability to set reminders based on meeting not accepted within X time period since booking the meeting rather than days before the meeting. For example, if we send a meeting request to a recipient 15 days before the meeting we want the ability to remind them on day 14 that we haven't received their acceptance of the meeting. Right now we need to set a time before the meeting if not accepted which could lead to significant delay.

Also the ability to mark the person as accepted if they don't have a mail client that sends calendar responses.