I see EWA as a way for Basis leads to keep up on weekly stats for their systems; to meet your requirement I believe you are going to have to setup the validation in your solman. IMHO SAP does this due to all business being different in how they run, each has to setup validations that meet their business requirements.
I would look at rsecnote and see how it works to get you started, this is the program that populates the security information in the EWA.