Multiple Appointments in one go


I am currently using the Appointments+ plugin for booking rooms in a meeting centre. Love it.

I want to provide users with the possibility to book multiple continuous time slots with one booking. For example, our time slots are 9-12, 12-15 and 15-18, so I want the client to be able to book 9-18 with one appointment instead of 3. Is it possible already, or can you provide me with hints for how to achieve it (I can php, sort of) or should I make a feature request?