Manual Bookings by store staff or admin

This feature would allow store staff/admin to manually create bookings via the Admin. The use case is when a customer calls or emails in or is in front of a store staff member but is not going to go online to make the booking themselves. Additionally, it would be great to be able to manually create a booking (without a Shopify order attached) Perhaps someone misses an event and you want to rebook at no charge, without having a sale and a discounted sale recorded etc.