Any examples that you can build will be hihgly appreciated by the community. The BPMN 2 langauge have a full blow specification behind, that's why there is not thing such a wait state. You need to understand the new language to know how your process will behave acording the language specification. Did you get the specification doc?
The code, as in every project is provided with unit tests that you can find in github, each jBPM module contains tests shows that the functionality provided works well. If you want to improve the docs and help the community that you are using to ask questions for free, you can easily clone the repository and send your pull request. We will help you during that process as much as we can.. because we are doing this for free and in our spare time.
Cheers