Hey ​@Cygnus-x1 - the first space I’d recommend raising this request is in the Ideas Portal, that is accessible from the top-banner of BeeKeepers. The Ideas Portal provides a method of requesting product features, and there are no guarantees to implementation. 

As for a DYI approach, we do provide the SDK to either create applications or custom plugin that allows customers to create flexible integrations that suite the need. For the GCP IAP solution, I’m assuming this is for a dedicated account where the users wouldn’t know their credential for login. This would be better suited to create a web application to inject the credentials. This would require the RDS target systems and individual maintenance if there are changes in GCP IAP login flow.