Is your feature request related to a problem? Please describe.
We have integreted Rocket Chat with KeyCloak via Custom Oauth. It works very good, but we have a problem with merging e-mails when changed on KeyCloak side. Name is merged perfect when changed in KeyCloak.
Important: Name is merged only when option "Merge users" is set TRUE.

Describe the solution you'd like
Please add an option to enable/disable merging emails and other information.

Server Setup Information:
Version of Rocket.Chat Server: 1.1.1
Operating System: Centos 7
Deployment Method: docker compose
Number of Running Instances: 9
DB Replicaset Oplog: yes
NodeJS Version: 8.11.4 - x64
MongoDB Version: 4.0