A Drag to pan (scroll) feature will be introduced for our next release (Q2 2013) which is expected next month.
To implement your scenario, I would recommend:
1. Loading your whole data inside the chart
2. Setting the chart Zoom / PanOffset so that only the last ten data points are visible
3. Hiding the PanZoomBar(s) and using the chart area drag to pan feature or setting the PanZoomBar in scroll-only mode (which currently is your only option).
The RadChartView has UI virtualization, so there is no need to load parts of the data on demand, because visual elements will be created only for the visible data points.
To see how the chart behaves in similar scenarios, please check these 2 online examples (ex1
the Telerik team