Kevin,
thanks for the information.
2 more questions :
1. Is there any matrix comparison features doc (Open Source vs Enterprise version) that I can refer to ?
2. I tried to create a simple workflow rule for Draft & Pending Approval Home space.
However, it seems like whoever that has a Contributor/Coordinator Rule can request approval/ approve / reject it. Is this statement correct ? (Apologize because I haven't tried other workflow type except "A Simple Workflow"). Assuming this feature is not built in yet, then :
I will think of a feature that once a user A submit "Request Approval", he will be able to select which user that can approve his submission doc.
Which means, creation of a new workflow, should provide more input parameter to be set.