We're evaluating controls for the same reason (school timetable scheduling) and also have to be able to only place events in certain predified time-slots (from 8:20 to 9:05, etc). And sadly we need events spanning multiple slots, so the suggestion from the previous post is not feasable.
As I can see from the last post. It is not that easy in DayPilot. So the question is more, how complicated would it be to change the source to handle this case? I'm prepared to invest some days to make it possible. But without buying the source yet, I can't check that, without checking it, I can't buy:-( I'd really love to use DayPilot Pro because it's just great and matching otherwise.
So if anyone who has a good knowledge of the code involved can give me some feedback or alternative suggestions, I'd be really greatful.