Provide way of storing arbitrary information on sign-up
All form-fields (even hidden) with a specific prefix (e.g. "userinfo_") that are posted to the sign-up resource should be stored as key-value pairs in the user-resource. The approach should be similar to the how the pipeline-configuration is handled and stored.
The stored information in the user-resource should only be readable by the administrator and the user in question.
Integrated support for custom properties into signup process