At the moment WF Editor gives GUI function to maintain WorkFlow elements but they are limited to Node and Transition creation. It should be able to also handle Condition and editing of their properties.
haven't tested, but from the screenshots it seems like the lists are entered as texts? (action, and/or, operation ... etc) if that's the case maybe is better to implement the corresponding list in the form.
At the moment WF Editor gives GUI function to maintain WorkFlow elements but they are limited to Node and Transition creation. It should be able to also handle Condition and editing of their properties.