Yes, that would definitely be an option. Look at this post and video that should help - http://surdilovic.wordpress.com/2012/08/06/process-and-task-form-editing-in-jbpm-designer/. The form widgets support for form creation in jBPM Designer should help. The ability to create your custom widgets is also I believe more powerful than having a visual form builder where you might be limited to the number of objects you can use and the technology a form builder may have support for.