In general you can extend the default period in the timeline - please take a look at this online demo.
Currently we do not provide this option in the Telerik SPRadScheduler Web Part configuration panel, but you can try inheriting the TelerikSPRadSchedulerWebPart class in order to set the relevant properties. Another approach is to create a Visual Web Part with a RadScheduler control in it.
Regarding your second question: in our latest Beta release we introduced the Resource Grouping feature in the TelerikSPRadScheduler Web Part. In a few days we will publish a demo for this feature and I will update you once the demo is online.
Regarding the drag and drop functionality - I am afraid that there is a limitation in RadScheduler - user can drop an appointment on the RadScheduler but cannot drag an appointment from the RadScheduler.
That is why currently we do not provide this feature in TelerikSPRadSchedulerWebPart.
All the best,
the Telerik team