Developer Guide / Quality Documentation for jBPM5

It would be really great to get some quality documentation to be done with some examples about jBPM5 rather than adding new features. Things like creating SubTasks, Group assignment etc. I am not talking about the User Guide. The User Guide is decen,t however not the thing a developer want. Please try to make a good Developer guide something like documentation provided by Spring Team. Last but not least, it would be really appreciated , if you get the javadocs. Many people have been asking about this on the forums and it would be great to have some quality documentation before adding in quality features which no one will ever get access to.