Which is why I suggested not a formal SDK but simply a source code dump

Necessarily, Q&A in the developer forum would be required - enTourage probably would have to dedicate a developer liason. This wouldn't be for noobs, it would be for experienced Android developers. Documentation could be built up via a wiki. An emulator (for the eInk screen) isn't necessary since developers prefer to connect the device to their development machine directly and run the code their working on right on the device to see how it will actually work.