It is not possible to set a custom range except the current views. By your example 5th and 6th of April - you can use dayview and navigate forward and backward through days via the left and right arrows on the upper left corner of the RadScheduler.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items