Kevin N wrote:
The relevant "Display Orientation" option is available when XCSoar
runs on my Ipaq 3870 (Where I don't need it!),
but not on my PNA (WayTeq x950), where I *do* need it.

The option is only available when the graphics driver supports display
rotation. Some do, some do not. There are driver updates for some
graphics chips to add it. There is nothing XCSoar can do about it.