The first contribution is in. It is an example of a JbpmCustomForkhandler for creating multiple parallel (identical) tasks
JbpmBeanShellDecisionHandler: This decision handler enables the use of beanshell scripts inside the processdefinition.xml file.
By much demand, there also is a JbpmTimedState now, based on the scheduler.
Here is a custom XOR-Join handler : XorJoinHandler.