This is the good thing of having jBPM5 integrated with Drools. You can create rules to define your business logic, so for example you can write rules that interacts with the Human Task Component to create dynamic tasks, escalate tasks, reasign tasks, etc.
You can take a look at this example that shows how an application that is not using a business process can use the Human Task Component.
https://github.com/Salaboy/Drools_jBPM5-Training-Examples/tree/master/jbpm5/06-jBPM5-HumanTasksAndRulesExample
Cheers