Did this problem occure to nobody else?
Is it common practice to avoid using the graphical editor and always create processes in XML?
Can someone verify if this will still be a problem in jBPM 5?
There's no exact match to the assign activity, in jBPM5 you would use a script node to set variables, like kcontext.setVariable("newVar", someOtherVar);
The idea of jBPM5 is to make sure you can do anything you want without having to look at the XML directly. You can still use that if you want, but you should never be obliged to do so.