If you are still looking for an embeddable decision / event handler for .net 4.0+ developers complete with a HTML5 graphical designer, visual process management, business intelligence in one package. May I suggest:
cDevWorkflow
This is their market niche. Providing an embeddable high performance C+ engine without all the restrictions or rules to get in your way.
Ease of Use the graphical workflow designer requires no special training.
Business Process Management tools enable users to track and control business activities.
Business Intelligence tools real-time process information: more throughput, less effort.
Embeddable Process Decision Engine increases workflow efficiencies by using runtime execution data.
Workflow FAQ's
http://www.cdevworkflow.com/workflow-faq/