Custom Joomla calendar Component

Hello, I would like to custom the component JoomlaXTC Appointment Book Manager to my need. This component allows to book any events from a calendar. It would be perfect but today, it is only possible to make one booking for one slot. You can have a look here : [login to view URL] I would like to attribute unlimited bookings to a slot so that many people can book the same event, at the same hour. Component URL : [login to view URL]:appointment-book-manager&catid=76:components&Itemid=902 I can send you the component files on demand.