There is an OnClientTimeSlotClick event that fires if the user clicks in a single time slot. If the user clicks in one time slot and drags to select multiple time slots before releasing the mouse button no event is fired. It would be useful if the existing event was fired in this case, or another event was added to fire in this case.
The scenario is described in this blog post -http://blogs.telerik.com/aspnet-ajax/posts/08-08-04/working-with-radscheduler-recurring-appointments-on-sql-server.aspx
When trying to drag and drop an appointment over the All Day slot, the ghost element is not positioned properly. This is easily observed when the browser is zoomed.
Replicated on the Overview demo