We have a similar request here: http://product.screenconnect.com/topics/82-add-some-sort-of-indicator-that-credentials-have-been-stored-for-session/

Would that option work for your use case?

This can be done by adding a RelayAddressableUri to your web.config, which is described here: https://docs.connectwise.com/ConnectWise_Control_Documentation/On-premises/On-premises_knowledge_base/Change_the_relay_addressable_URI