I would like DE to work with the Sony devices because I like it for its quickness ease of use and convivial design.
On a practical note I don't think it can yet be implemented in the same way it is on a computer. Simply, there is no animation possible on a reader and DE's displaying prowess is built around the visual dynamics of Flash. In DE when one chooses to change font size, for example, the text is seen to blow up, litterally. On a reader such movements are not possible. If it is implemented it will not be dynamic, which is in my view one of the better aspects of this software.
DE as it is would be better used on a refresh rate capable LCD display such as a PDA.