Ok, I found a solution for the "optional" point. I'm now able to get additional information about the current process like the name, instance and the node itself with all its variables. But I need still the current user of the jBPM console. Any idea?
To whom it may concern:
With the kcontext variable which you can also access in scripts, you are an object of the class using org.drools.spi.ProcessContext which implements the following interface:
As you can see, you can get all the information about the process instances, node instances including all the variables.