Suggestion: custom reminders for events for each individual entry

I have been using the calendar to keep track of appointments and family events and it works great. I have now been implementing using it to show due dates for things like homework or when bills are due. I know in the settings, you can assign a generic reminder notification time, but that seems to apply to everything across the board. I was wondering/hoping if the reminder function could be implemented for each item individually. For example, I may only need an appointment reminder an hour before it happens, but I would like reminders for due dates for homework and bills to be several days or even a week ahead of time, possibly even assigning a couple of reminders (1 week before as well as 2 days before).

On top of that, it could be useful to have to ability to mark the item complete which would turn that item's future reminder off because you no longer need the reminder.