RadTreeView supports both scrolling and dragging operations via touch device.
To scroll the nodes simply drag the whole control to the desired location (left, right, up, down).
Here is the result of scrolling the control down:
To drag a node together with its children to a new position, simply drag the desired node to the desired position and it will be moved there together with its children if such exists
Here you can see the dragged "Search Folders" section from the bottom of the left tree to the top of the right one