Hi all,
I realize that this thread is rather old now, but I've attached the binary kernel module gadget that the ASUS EeeNote uses to accomplish precisely this task.
It appears to be dependent upon a pxa3xx processor, but perhaps it could be reverse engineered to give you some ideas on implementing this for the iRex devices.
It appears that the relevant command is:
insmod g_wacom_tablet.ko handle_mode=[X]
[X] is either 0 or 1 and appears to determine the orientation as either landscape left or landscape right.
pb
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