Adding Holiday using availability

It would be useful from an admin perspective to save time if someone was booking two weeks off when you are adding the visit you could select the full duration of the holiday and it can use the preset availability to work out the amount of days off the rota. For example if a part time carer works Monday, Wednesday and Friday and wants 2 weeks off you could select the full 14 day term and only use 6 days holiday as the availability is predefined.