This would appear to be a non-starter due to the lack of a BIOS and the limited amount of RAM. I haven't attempted to try anything here.
However the boot process described under the Firmware tab potentially does give the more adventurous the opportunity to have code loaded and run.
I must admit I really like the low power consumption of the WT1200LE and the way that the entire operating system and applications fit in less than 512KB! Unfortunately there is no SDK that I'm aware of that would let anyone easily re-purpose the unit.