visual indicator/TAB colour for read-only connection
Ability to set a different TAB colour for read only connections to an instance e.g. to differentiate between connections to primary and read-only secondary in AOAG. This would need to inspect the ApplicationIntent=ReadOnly connection property. n.b. I have tried doing this with a registered server group containing just the one read only server, but it uses the TAB colour defined for that server, not the group, so cannot distinguish whether read-only or not.
Michael Andrews commented
I would add you don't even need to inspect the application intent, as there could be tons of roles a user has. Just let us set the colors based on the server + a username. That to me feels like it'd be an easier implementation, and much more versatile for end users.