We need a custom defined role to perform specific functions in the OPS Manager.

For Example --> We need a custom defined role which can perform subset of functions from Project Automation Admin Role + Project Read Only Role + rs.stepDown() functionality

Project Automation Admin Role:

View deployments.
Provision machines.
Edit configuration files.
Download the MongoDB Agent.
+ Project Read Only role.

Project Read Only Role:

Activity
Operational data
Ops Manager Users
Ops Manager User roles.

** This feature becomes very useful to contain the access of certain privileges and to have the flexibility tailormade privileges instead of giving the access to entire system defined role.