I hope its OK to jump on the back of this post. I am also looking for something similar. I already use jevents to show calendar of events but now we want the user to be able to book and pay for a timeslot for that event, i.e. an appointment. I see you have referred people to RSVP Pro for this type of functionality but I can't see how it would work for booking actual timeslots. Have you got a demonstration of it working in that manner?
Also, we want to use the payment gateway eWay, which we already have setup via Virtuemart. does this mean we can direct payments from jEvents to virtuemart for payment via eway?