I recently got my P1510, and do like the device.
I have tried setting the device to 1024x768, which works and behaves as a larger virtual desktop that scrolls.
But the touchscreen is completely useless: it maps the corners to the corners of the desktop, not to those of the panel.
(this can be clearly seen when calibrating the display; just use the trackpoint to scroll up/down)
Am I doing something wrong, or is this the way it works?