Is it recommended to manage and store external user profile registration and their subscription,notification preferences in Adobe AEM/CQ5

[varshsr]

Is it recommended to manage and store external user profile registration  and their subscription,notification preferences in Adobe AEM/CQ5 considering the following parameters-Reverse replication,Maintainability of external user nodes,Scalability?

[perfecci0nista]

Interesting !! I was looking for answers to the same question.