The Camunda Modeler is the editor for BPMN process flows. It is a standalone application. NOTE: the Camunda eclipse plugin is no longer supported and should not be used.
Some work has already been done in MSO to develop templates for "building block" subprocess flows. When a template is provided for a BPMN element, the modeler displays a custom form for inputting parameters. This significantly simplifies flow construction and reduces the chance of making mistakes.