what is the dump you get in ST22? Roadmap forms should be possible without start object for example like Hiring etc
http://scn.sap.com/community/erp/hcm/blog/2014/08/04/roadmap-forms-and-dynamic-processing-rules--enhanced-data-quality-and-higher-system-automation-with-hr-renewal-20-feature-pack-1 But note that Roadmap Forms start with the step ‘General Process Data’