User defined time slots

Hi!

This addon is great, but i think it lacks a few features to be a real killer. One of these is that you can't define custom time slots, like this:

An event lasts for 3 days. First day there are hourly slots from 9:00 to 15:00, second day from 9:00 to 15:00 again and last day from 9:00 to midday, as the rest of the time will be spent on closing ceremony and cocktail.

What I see is that this creates timeslots for the entire event, including late night. The alternative is to create a node for every day's event, but this is not a good idea, as it doesn't allow you to see the event as a whole, in a single node.

Anyway, this is a useful module.