Sunny - the ability to configure the global tenant settings under sailpoint.api.identitynow.com/v3/access-request-config is something we want to do long term, but it will not be a part of this effort most likely. In addition, preventing users from duplicates is likely out of scope here. I’d recommend looking for similar ideas in the idea portal.
Our focus here is exposing pending and completed access requests and allowing action on pending access requests for administrators, which has to be done via API only today.